Article: ISO 80000 or IEC 80000, Quantities and units, is an international standard describing the International System of Quantities (ISQ).
It was developed and promulgated jointly by the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC).
It serves as a style guide for using physical quantities and units of measurement, formulas involving them, and their corresponding units, in scientific and educational documents for worldwide use.
The ISO/IEC 80000 family of standards was completed with the publication of the first edition of Part 1 in November 2009.
Overview
By 2021, ISO/IEC 80000 comprised 13 parts, two of which (parts 6 and 13) were developed by IEC and the remaining 11 were developed by ISO, with a further three parts (15, 16 and 17) under development. Part 14 was withdrawn.
PartYearNameReplacesStatusISO 80000-12022GeneralISO 31-0, IEC 60027-1 and IEC 60027-3 ISO 80000-22019MathematicsISO 31-11, IEC 60027-1 ISO 80000-32019Space and timeISO 31-1 and ISO 31-2 ISO 80000-42019MechanicsISO 31-3 ISO 80000-52019ThermodynamicsISO 31-4 IEC 80000-62022ElectromagnetismISO 31-5 ISO 80000-72019Light and radiationISO 31-6 ISO 80000-82020AcousticsISO 31-7 ISO 80000-92019Physical chemistry and molecular physicsISO 31-8 ISO 80000-102019Atomic and nuclear physicsISO 31-9 and ISO 31-10 ISO 80000-112019Characteristic numbersISO 31-12 ISO 80000-122019Condensed matter physicsISO 31-13 IEC 80000-132008Information science and technologysubclauses 3.8 and 3.9 of IEC 60027-2:2005 IEC 80000-142008Telebiometrics related to human physiologyIEC 60027-7 IEC 80000-15Logarithmic and related quantities IEC 80000-16Printing and writing rules IEC 80000-17Time dependency
Subject areas
By 2021 the 80000 standard had 13 published parts. A description of each part is available online, with the complete parts for sale.
Part 1: General
ISO 80000-1:2022 revised ISO 80000-1:2009, which replaced ISO 31-0:1992 and ISO 1000:1992.
This document gives general information and definitions concerning quantities, systems of quantities, units, quantity and unit symbols, and coherent unit systems, especially the International System of Quantities (ISQ).
The descriptive text of this part is available online.
Part 2: Mathematics
ISO 80000-2:2019 revised ISO 80000-2:2009, which superseded ISO 31-11.
It specifies mathematical symbols, explains their meanings, and gives verbal equivalents and applications. The descriptive text of this part is available online.
Part 3: Space and time
ISO 80000-3:2019 revised ISO 80000-3:2006, which supersedes ISO 31-1 and ISO 31-2.
It gives names, symbols, definitions and units for quantities of space and time.
The descriptive text of this part is available online.
A definition of the decibel, included in the original 2006 publication, was omitted in the 2019 revision, leaving ISO/IEC 80000 without a definition of this unit; a new part of the standard, IEC 80000-15 (Logarithmic and related quantities), is under development.
Part 4: Mechanics
ISO 80000-4:2019 revised ISO 80000-4:2006, which superseded ISO 31-3.
It gives names, symbols, definitions and units for quantities of mechanics.
The descriptive text of this part is available online.
Part 5: Thermodynamics
ISO 80000-5:2019 revised ISO 80000-5:2007, which superseded ISO 31-4.
It gives names, symbols, definitions and units for quantities of thermodynamics.
The descriptive text of this part is available online.
Part 6: Electromagnetism
IEC 80000-6:2022 revised IEC 80000-6:2008, which superseded ISO 31-5 as well as IEC 60027-1.
It gives names, symbols, and definitions for quantities and units of electromagnetism.
The descriptive text of this part is available online.
Part 7: Light and radiation
ISO 80000-7:2019 revised ISO 80000-7:2008, which superseded ISO 31-6.
It gives names, symbols, definitions and units for quantities used for light and optical radiation in the wavelength range of approximately 1 nm to 1 mm.
The descriptive text of this part is available online.
Part 8: Acoustics
ISO 80000-8:2020 revised ISO 80000-8:2007, which revised ISO 31-7:1992.
It gives names, symbols, definitions and units for quantities of acoustics. The descriptive text of this part is available online.
It has a foreword, scope introduction, scope, normative references (of which there are none), as well as terms and definitions. It includes definitions of sound pressure, sound power and sound exposure, and their corresponding levels: sound pressure level, sound power level and sound exposure level. It includes definitions of the following quantities:
logarithmic frequency range static pressure sound pressure sound particle displacement sound particle velocity sound particle acceleration
volume flow rate, volume velocity
sound energy density sound energy sound power sound intensity sound exposure
characteristic impedance for longitudinal waves
acoustic impedance sound pressure level sound power level sound exposure level reverberation time
Part 13: Information science and technology
IEC 80000-13:2008 was reviewed and confirmed in 2022 and published in 2008, and replaced subclauses 3.8 and 3.9 of IEC 60027-2:2005 and IEC 60027-3.
It defines quantities and units used in information science and information technology, and specifies names and symbols for these quantities and units. It has a scope; normative references; names, definitions and symbols; and prefixes for binary multiples.
Quantities defined in this standard are:
traffic intensity [A]: number of simultaneously busy resources in a particular pool of resources
traffic offered intensity [A0]: traffic intensity ... of the traffic that would have been generated by the users of a pool of resources if their use had not been limited by the size of the pool
traffic carried intensity [Y]: traffic intensity ... of the traffic served by a particular pool of resources
mean queue length : time average of queue length
loss probability [B]: probability for losing a call attempt
waiting probability [W]: probability for waiting for a resource
call intensity, calling rate [λ]: number of call attempts over a specified time interval divided by the duration of this interval
completed call intensity [μ]: call intensity ... for the call attempts that result in the transmission of an answer signal
storage capacity, storage size [M]
equivalent binary storage capacity [Me]
transfer rate [r, (ν)]
period of data elements [T]
binary digit rate, bit rate [rb, rbit (νb, νbit)]
period of binary digits, bit period [Tb, Tbit]
equivalent binary digit rate, equivalent bit rate [re, (νe)]
modulation rate, line digit rate [rm, u]
quantizing distortion power [TQ]
carrier power [Pc, C]
signal energy per binary digit [Eb, Ebit]
error probability [P] Hamming distance [dn]
clock frequency, clock rate [fcl]
decision content [Da] information content entropy [H]
maximum entropy [H0, (Hmax)]
relative entropy [Hr] redundancy [R] relative redundancy [r] joint information content conditional information content
conditional entropy, mean conditional information content, average conditional information content
equivocation irrelevance [C]
transinformation content [T(x, y)]
mean transinformation content [T]
character mean entropy [H′]
average information rate [H*]
character mean transinformation content [T′]
average transinformation rate [T*]
channel capacity per character; channel capacity [C′]
channel time capacity; channel capacity [C*]
The Standard also includes definitions for units relating to information technology, such as the erlang (E), bit (bit), octet (o), byte (B), baud (Bd), shannon (Sh), hartley (Hart) and the natural unit of information (nat).
Clause 4 of the Standard defines standard binary prefixes used to denote powers of 1024 as 10241 (kibi-), 10242 (mebi-), 10243 (gibi-), 10244 (tebi-), 10245 (pebi-), 10246 (exbi-), 10247 (zebi-) and 10248 (yobi-).
International System of Quantities
Part 1 of ISO 80000 introduces the International System of Quantities and describes its relationship with the International System of Units (SI). Specifically, its introduction states "The system of quantities, including the relations among the quantities used as the basis of the units of the SI, is named the International System of Quantities, denoted 'ISQ', in all languages." It further clarifies that "ISQ is simply a convenient notation to assign to the essentially infinite and continually evolving and expanding system of quantities and equations on which all of modern science and technology rests. ISQ is a shorthand notation for the 'system of quantities on which the SI is based'."
Units of the ISO and IEC 80000 series
The standard includes all SI units but is not limited to only SI units. Units that form part of the standard but not the SI include the units of information storage (bit and byte), units of entropy (shannon, natural unit of information and hartley), and the erlang (a unit of traffic intensity).
The standard includes all SI prefixes as well as the binary prefixes kibi-, mebi-, gibi-, etc., originally introduced by the International Electrotechnical Commission to standardise binary multiples of byte such as mebibyte (MiB), for 2 bytes, to distinguish them from their decimal counterparts such as megabyte (MB), for precisely one million (2) bytes. In the standard, the application of the binary prefixes is not limited to units of information storage. For example, a frequency ten octaves above one hertz, i.e., 210 Hz (), is one kibihertz (1 KiHz). These binary prefixes were standardized first in a 1999 addendum to IEC 60027-2.
The harmonized IEC 80000-13:2008 standard cancels and replaces subclauses 3.8 and 3.9 of IEC 60027-2:2005, which had defined the prefixes for binary multiples. The only significant change in IEC 80000-13 is the addition of explicit definitions for some quantities.
See also
International Vocabulary of Metrology
International System of Units
BIPM – publishes freely available information on SI units
NIST – official U.S. representative for SI; publishes freely available guide to use of SI
References External links BIPM SI Brochure
ISO TC12 standards – Quantities, units, symbols, conversion factors
NIST Special Publication 330 – The International System of Units
NIST Special Publication 811 – Guide for the Use of the International System of Units |
Source: Environmental Data Coding Specification (EDCS)
3 Terms, definitions, symbols and abbreviated terms
3.1 Introduction
3.1.1 Table of contents
Table 3.1 — Table of contents
3 Terms, definitions, symbols and abbreviated terms
3.1.1 Table of contents
3.3 Abbreviated terms 3.1 Introduction
3.2 Terms and definitions
Table 3.2 — Table of tables
Table 3.1 — Table of contents
Table 3.2 — Table of tables
Table 3.3 — Abbreviated terms
3.2 Terms and definitions
For the purposes of this document, the following terms and definitions apply:
3.2.1 attribute
one of the data types whose instances provide values that taken together specify
the state of an environmental object 3.2.2 base quantity quantity
in a conventionally chosen
subset of a given
system of quantities , where no quantity
in the subset can
be expressed in terms of the other
quantities within that subset [ ISO 80000-1:2009 , 3.4]
NOTE 1 The subset mentioned in the definition is termed
the "set of base quantities".
NOTE 2 Base quantities are referred to as
being mutually independent since a base quantity cannot be expressed as a
product of powers of the other base quantities.
NOTE 3 'Number of entities' can be
regarded as a base quantity in any
system of quantities . 3.2.3 base unit measurement unit
that is adopted by convention
for a base quantity [ ISO 80000-1:2009 , 3.10]
NOTE 1 In each
coherent system of units
, there is only
one base unit for each
base quantity .
EXAMPLE 1 In the
SI
, the metre is the base unit of length. In
the CGS systems, the centimetre is the base unit of length.
NOTE 2 A base unit may also serve for a
derived quantity of the same quantity dimension. EXAMPLE 2 The derived quantity rainfall,
when defined as areic volume (volume per area), has the metre as a
coherent derived unit in the SI .
NOTE 3 For number of entities, the number one,
symbol
1, can be regarded as a base unit in any
system of units . 3.2.4 Basic Latin character
character from U+0020 to U+007E
[ ISO/IEC 10646:2012 ] 3.2.5 Basic Latin string string consisting of Basic Latin characters 3.2.6 classification information defining the type of an object 3.2.7 code
compact and not necessarily human-understandable designator that is used to denote a concept
3.2.8 coherent derived unit derived unit that, for a given system of quantities and for a chosen set of base units ,
is a product of powers of
base units with no other
proportionality factor than one
[ ISO 80000-1:2009 , 3.12]
NOTE 1 A power of a
base unit is the base unit
raised to an exponent.
NOTE 2 Coherence can be determined only with respect to a
particular system of quantities and a given set of base units .
EXAMPLE If the metre, the second, and the mole are
base units
, the metre per second is the
coherent derived unit of velocity when velocity is defined by the
quantity equation v = d r /d t
and the mole per cubic metre is the
coherent derived unit of amount-of-substance concentration when
amount-of-substance concentration is defined by the
quantity equation c = n / V
. The kilometre per hour and the knot are not
coherent derived units in such a
system of quantities .
NOTE 3 The coherent derived unit for every
derived quantity
of dimension one in a
given system of units
is the number one,
symbol
1. The name and
symbol of the measurement unit one are generally not indicated. 3.2.9
coherent system of units
system of units
, based on a given
system of quantities
, in which the
measurement unit for each derived quantity is a coherent derived unit [ ISO 80000-1:2009 , 3.14]
EXAMPLE Set of coherent
SI
units and relations between them.
NOTE A system of units
can be coherent only with respect to a
system of quantities and the adopted base units . 3.2.10 derived quantity quantity , in a system of quantities ,
defined in terms of the
base quantities of that system [ ISO 80000-1:2009 , 3.5] EXAMPLE In a system of quantities having the base quantities length and mass,
mass density is a derived quantity defined as the quotient of mass and
volume (length to the power three).
3.2.11 derived unit measurement unit for a derived quantity [ ISO 80000-1:2009 , 3.6] 3.2.12 EDCS dictionary
set of entries of a similar nature each of which specifies a concept
and includes a code , a label ,
and a concept definition as well as other concept-dependent information
3.2.13 enumerant
one of the possible values of an enumerated data type
[ ECS ] 3.2.14 environment
set of physical circumstances and/or conditions, including both
natural and man-made phenomena
3.2.15 equivalent units set of units of measurement
that characterize the same
physical quantity 3.2.16 group
one of the set of concepts that are members of
an organizational schema 3.2.17
International System of Quantities
ISQ system of quantities based on the seven base quantities : length,
mass, time, electric current, thermodynamic temperature,
amount of substance, and luminous intensity
[ ISO 80000-1:2009 , 3.6] NOTE 1 This system of quantities
is published in the
ISO 80000 and IEC 80000 series Quantities and units
,
Parts 3 to 14.
NOTE 2 The
International System of Units
( SI ) (see [ ISO 80000-1:2009
, item 3.16]) is based on the ISQ.
3.2.18
International System of Units
SI system of units
, based on the
International System of Quantities
, their names and symbols
, including a series of prefixes
and their names and
symbols
, together with rules for their use,
adopted by the General Conference on Weights and Measures (CGPM)
[ ISO 80000-1:2009 , 3.16]
NOTE 1 The SI is founded on the seven
base quantities of the ISQ
and the names and
symbols of the corresponding base units , see [ ISO 80000-1:2009 , 6.5.2]. NOTE 2 The base units and the coherent derived units
of the SI form a
coherent set, designated the "set of coherent SI units".
NOTE 3 In quantity calculus, the
quantity
'number of entities' is
often considered to be a
base quantity , with the base unit one, symbol 1. 3.2.19 label
human-understandable designator that is used to denote a concept
3.2.20 numerical value
a real number that represents a
quantity 3.2.21 object
conceptual structure having both
type and state 3.2.22 organizational schema
end result of a process of concept characterization, comprised of a set of
groups of concepts 3.2.23 physical quantity quantity
that can be used in the mathematical equations of science and technology
3.2.24 quantity
property of a phenomenon, body, or substance, where the property has a
magnitude that can be expressed by means of a number and a reference
[ ISO 80000-1:2009 , 3.1] 3.2.25
state (of an object)
one of the possible modes of existence of an
object
as defined by the collective values of its
attributes 3.2.26 symbol
short, scientific notation for a
unit of measurement
or a scale factor or both
3.2.27 system of quantities set of quantities together with a
set of non-contradictory equations relating those
quantities [ ISO 80000-1:2009 , 3.3]
NOTE Ordinal quantities (see
[ ISO 80000-1:2009
, 3.26]), such as
Rockwell C hardness, and nominal properties (see
[ ISO 80000-1:2009 , 3.30]),
such as colour of light, are usually not considered to be part of a
system of quantities because they
are related to other
quantities
through empirical relations only.
3.2.28 system of units set of base units and derived units
, together with their multiples and
submultiples, defined in accordance with given rules, for a given
system of quantities [ ISO 80000-1:2009 , 3.13] 3.2.29
type (of an object)
essential aspects of an
object that characterize
and distinguish it from other
objects 3.2.30 unit of measurement measurement unit unit real scalar quantity , defined and
adopted by convention, with which any other
quantity
of the same kind can be
compared to express the ratio of the second
quantity
to the first one as a
number [ ISO 80000-1:2009 , 3.9] 3.2.31
value (of a physical quantity
)
quantitative expression of a particular
physical quantity
as the pairing of a
real number and a
unit of measurement , the
real number being called its
numerical value 3.3 Abbreviated terms Table 3.3
lists the abbreviated terms
used in this International Standard except for those abbreviated terms used only
in the construction of labels, which are listed in
Annex G
. In the specification of an abbreviation, the
letters in the abbreviated term used to form the abbreviation are presented in
upper-case and other letters are presented in lower-case with one exception.
When the abbreviated term includes another abbreviation that is is used to form
the abbreviation for that term, all the letters of the included abbreviation are
presented in upper-case even if all of the letters are not used in the formed
abbreviation.
Table 3.3 — Abbreviated terms
Abbreviation Abbreviated term ABS Acrylonitrile Butadiene Styrene ACC Area Control Centre ACS Airfield Control Station ADRG ARC Digitized Raster Graphic AGL Above Ground Level ALP Articulated Loading Platform ANDES
Ambient Noise Directionality Estimation System
APAP
Approach Path Alignment Panel
API Application Program Interface AR Authoritative Reference ARC
equal Arc-second Raster Chart
ARCP
Air Refueling Control Point
ARIP
Air Refueling Initial Point
ARTCC
Air Route Traffic Control Centre
ASAPS
Advanced Surveillance Acoustic Prediction System
ASEPS
Automated Signal Excess Prediction System
ASNM
Arctic Storm Noise Model
ASPM
Acoustic System Performance Model
ASTRAL ASEPS TRAnsmission Loss ASW Anti-Submarine Warfare ATC Air Traffic Control ATS Air Traffic Service ATZ Air Traffic Zone AVLB
Armoured Vehicle Launched Bridge
BOMIS BOttom-Mounted Instrumentation System BRDF
Bidirectional Reflectance Distribution Function
CADIZ
Canadian Air Defense Identification Zone
CASS
Comprehensive Acoustic Sonar Simulation
CAVOK
Ceiling And Visibility O.K.
CCA Continental Control Area CCTT
Close Combat Tactical Trainer
CH Clay, High-plasticity CL Clay, Low-plasticity COLREGS
international REGulationS for avoiding COLlisions at sea
COMNAVFE
COMmander, NAVal forces Far East
COMNAVPAC
COMmander, NAVal forces PACific
CONUS CONtinental United States CTA ConTrol Area CZ Control Zone DAFIF
Digital Aeronautical Flight Information File
DANES
Directional Ambient Noise Estimation System
DEW Distant Early Warning DEWIZ
Distant Early Warning Identification Zone
DEWMIZ
Distant Early Warning Military Identification Zone
DMA Defense Mapping Agency DME Distance Measuring Equipment DND
Department of National Defence
EA EDCS Attribute EAC EDCS Attribute Code EAL EDCS Attribute Label EC EDCS Classification ECC EDCS Classification Code ECL EDCS Classification Label EDCS
Environmental Data Coding Specification
EE EDCS attribute Enumeration EEC EDCS attribute Enumeration Code EEL EDCS attribute Enumeration Label EG EDCS Group EGC EDCS Group Code EGL EDCS Group Label EHF Extremely High Frequency ELF Extremely Low Frequency EO EDCS Organizational schema EOC EDCS Organizational schema Code EOL EDCS Organizational schema Label EQ EDCS unit eQuivalence class EQC EDCS
unit eQuivalence class Code
EQL EDCS
unit eQuivalence class Label
ES EDCS unit Scale ESC EDCS unit Scale Code ESL EDCS unit Scale Label ETRS
European Terrestrial Reference System
EU EDCS Unit EUC EDCS Unit Code EUL EDCS Unit Label EV EDCS attribute Value characteristic EVC EDCS
attribute Value characteristic Code
EVL EDCS
attribute Value characteristic Label
FAA
Federal Aviation Administration (
US ) FANM
Fast Ambient Noise Model
FEPE
Finite Element Parabolic Equation
FIC Flight Information Centre FIPS
Federal Information Processing Standards
FM Fan Marker FORACS
Fleet Operational Readiness Accuracy Check Site
FSS Flight Service Station GC Gravely Clays GCA Ground Controlled Approach GCI Ground Controlled Intercept GM Gravel Mixture GP Gravels, Poorly-graded GPS Global Positioning System GRAB Gaussian RAy Bundle GSE Geocentric Solar Ecliptic GTRS GeoTile Reference System GW Gravels, Well-graded HF High Frequency HTML HyperText Markup Language HVAC
Heating, Ventilation, and Air Conditioning
IALA
International Association of Lighthouse Authorities
ICAO
International Civil Aviation Organization
ICW IntraCoastal Waterway IDZ IDentification Zone IEC International Electrotechnical Commission IEEE
Institute of Electrical and Electronics Engineers
IFR Instrument Flight Rules IHO International Hydrographic Organization ILS Instrument Landing System IMO International Maritime Organization INR INformation Region INS Inertial Navigation System INZ INformation Zone IR Informative Reference ISO
(this is the short name for the International Organization for Standardization)
JMCDM Joint METOC Conceptual Data Model JPEG
Joint Photographic Experts Group
JTC Joint Technical Committee L/MF Low/Medium Frequency LANDSAT LAND SATellite LCAC
Landing Craft Air Cushion
LF Low Frequency LORAN LOng-RAnge Navigation MAD Magnetic Anomaly Detector MALSF
Medium intensity Approach Light system with Sequenced Flashers
MALSR
Medium intensity Approach Light System with Runway alignment indicator lights
MATZ
Military Air Traffic Zone
MCAC
Military Common Area Control
METOC METeorology and OCeanography MF Medium Frequency MH Micaceous silts, High-plasticity MIR Mid InfraRed ML Micaceous silts, Low-plasticity MLC Military Load Classification ML-CL
Micaceous silts, Low-plasticity; Clays, Low-plasticity
MLS Microwave Landing System MSL Mean Sea Level NATO
North Atlantic Treaty Organization
NDB Non-Directional Beacon NGA National Geospatial-intelligence Agency NIMA
National Imagery and Mapping Agency
NIR Near InfraRed OCA Oceanic Control Area ODALS
OmniDirectional Approach Lighting System
ODAS
Ocean Data Acquisition System
OH Organic clays, High-plasticity OIS Obstruction Identification Surface OKTA
(corruption of octal, meaning one-eighth)
OL Organic clays, Low-plasticity OMEGA
Optimized Method for Estimated Guidance Accuracy (
VLF navigation system) ONC Operational Navigational Chart PAPI
Precision Approach Path Indicator
PAR Precision Approach Radar PEM Porous European Mix PMP Pomtommo Mostovoj Park PNG Portable Network Graphics POL
Petroleum, Oils, and Lubricants
PR Prescriptive Reference PT PeaT (highly organic) PVASI
Pulsating Visual Approach Slope Indicator
PVC PolyVinyl Chloride QNH
atmospheric pressure (Q) at Nautical Height (aviation)
QTG
The Q code (a standardized collection of three-letter codes for radiotelegraph communication, usually in question/answer form) for 'Will you send two dashes of 10 seconds each followed by your call sign? I am going to send two dashes of 10 seconds each followed by my call sign.'
RACON RAdar transponder beaCON RAIL
Runway Alignment Indicator Lights
RAM Range-dependent Acoustic Model RANDI
Research Ambient Noise DIrectionality
RCI Rating Cone Index RCN Royal Canadian Navy REIL
Runway End Identifier Lights
RF Radio Frequency RGB
Red Green Blue (colour model)
RMS Root-Mean-Square RPM Revolutions Per Minute SC Sandy Clays SHF Super High Frequency SI
Système International d'unités (International System of Units)
SIGNI
signs and SIGNals on Inland waterways
SLF Super Low Frequency SM Sandy Mixture SOED
Shorter Oxford English Dictionary
SP Sandy, Poorly-graded SPOT
Satellite Pour l'Observation de la Terre
SRA Special Rules Area SRZ Special Rules Zone SSALF
Simplified Short Approach Lighting system with sequenced Flashing lights
SSN SunSpot Number STOL
Short Take-Off and Landing
SUA Special Use Airspace SW Sandy, Well-graded TACAN TACtical Air Navigation TAPPS
Towed Array Performance Prediction System
TEL Transporter-Erector-Launcher TNT TriNitroToluene TRCV TRi-Colour VASI TSS Traffic Separation Scheme TUTT
Twin Unit Tractor Tug
TVASI T- VASI TZ Traffic Zone UHF Ultra High Frequency UK United Kingdom ULF Ultra Low Frequency UN United Nations US
United States of america
USCS
Unified Soil Classification System
USGS
United States Geodetic Survey
USS United States Ship USSR
Union of Soviet Socialist Republics
USWMS
Uniform State Waterway Marking System
UVA UltraViolet A UVB UltraViolet B UVC UltraViolet C VASI
Visual Approach Slope Indicator
VF Voice Frequency VFR Visual Flight Rules VHF Very High Frequency VLF Very Low Frequency VOR VHF Omnidirectional Range station VORTAC VOR and TACAN VSTOL
Vertical and Short Take-Off and Landing
VTOL
Vertical Take-Off and Landing
WGS World Geodetic System WMO World Meteorological Organization WW World War http://standards.iso.org/ittf/PubliclyAvailableStandards/index.html |