Compared to ITS mobility services cooperative functions and technologies of C-ITS represent still a very dynamic area where terms and abbreviation are further under development and harmonisation. The CAR 2 CAR Communication Consortium publishes the C-ITS Glossary for supporting he better understanding of the C-ITS developments and related publications. By nature the Glossary is not complete and will be therefore updated from time to time.  

Glossary

AbbreviationExplanation
3GPP3rd Generation Partnership Project, unites the telecommunications standard development organisations ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC
3GPP Release 14Covers a series of mission critical enhancements, LTE sidelink support for V2X services, eLAA, Uu 4 band Carrier Aggregation, narrow-band IoT.
3GPP Release 15Contains update for Uu link (1024 QAM), refined eLAA, enhancements to NB IoT, and enhancements/fixes for sidelink V2X.
3GPP Release 16Shall be completed by June 2020, covers a. o. multimedia priority service, vehicle-to-everything (V2X) application layer services, 5G satellite access, Local Area Network support in 5G, wireless and wireline convergence for 5G, terminal positioning and location, communications in vertical domains and network automation, new radio, … 
5G NR V2XDirect communication specified by 3GPP R16 based on a new radio (NR) interface. 5G V2X is neither co-channel coexistent (not compatible) with LTE-V2X release 14, 15 nor with WLANp. 5G V2X is not interoperable on physical air interface neither with LTE-V2X release 14, 15 nor with WLANp.
5.8 GHzTolling: The band 5 795 MHz to 5 815 MHz has been harmonised for the use by Transport and Traffic Telematics (TTT), also called CEN DSRC, by the EC decision 2013/752/EU and the ECC recommendation ECC/REC/70-03, which is primarily used for road charging systems in Europe and elsewhere
5.9 GHzITS spectrum for cooperative applications: vehicle-to-vehicle, vehicle-to-infrastructure-, vehicle-to-pedestrian communication, TR 102 492-2:
5,855 to 5875 MHz for non-safety ITS (ECC REC (09)01, Implementing DEC (EU) 2019/1345, ERC REC 70-03)5,875 5,905 GHz for safety-related Road ITS applications ECC DEC (08)01, EC DEC 2008/671
5905 to 5925 MHz as future extension of the ITS  (ECC DEC (08)01)band
64 GHz63,72-65,88 GHz: TTT, available to vehicle-to-vehicle, vehicle-to-infrastructure and infrastructure-to-vehicle systems. Implementing DEC (EU) 2019/1345
AAAuthorisation Authority
ABSAnti-lock Braking System
ACCAdaptive Cruise Control
ADASAdvanced Driver Assistance System
AEBAutonomous Emergency Braking
AEFAgricultural Industry Electronics Foundation
Amsterdam Groupstrategic alliance of committed key stakeholders CEDR, ASECAP, POLIS and C2C-CC
ANSSIAgence nationale de la sécurité des systèmes d'
information, National Cybersecurity Agency of France
ApplicationComputer program that performs a function useful to the user
ASECAPEuropean Association of Operators of Toll Road Infrastructures
ASN.1Abstract Syntax Notation One is an International Standards Organisation (ISO) data representation format [ITU-T X.691/ISO/IEC 8825-2]
ASRAnti-Slip Regulation
ATAuthorisation Ticket, a.k.a. Pseudonym Certificate (PC)
AUTAutomatic Transmission
BSIGerman Federal Office for Information Security
BSPBasic System Profile of the CAR 2 CAR Communication Consortium
BTPBasic Transport Protocol
C-ACCCooperative Adaptive Cruise Control
Car2CarCooperative Vehicle-to-Vehicle communication based on ITS-G5
Car2ICooperative Vehicle-to-Infrastructure communication based on ITS-G5
Car2VRUCooperative Vehicle-to-Vulnerable Road User communication based on ITS-G5
Car2XCooperative Vehicle-to-Anything communication based on ITS-G5
C-ITSCooperative Intelligent Transport Systems and Services,
refers to transport systems, where the cooperation between two or more ITS sub-systems (personal, vehicle, roadside and central) enables and provides an ITS service that offers better quality and an enhanced service level, compared to the same ITS service provided by only one of the ITS sub-systems
C-I2XCooperative Infrastructure-to-Anything communication
C-RoadsEuropean platform for harmonising C-I2X services and ensuring interoperability of C-ITS infrastructure implementations
C-V2XCooperative Vehicle-to-Anything communication,
Note: others like 5GAA might use this term differently and interpret it as LTE V2X
C2C-CCCAR to CAR Communication Consortium
CACertificate Authority
CAMCooperative Awareness Message according to EN 302 637-2
CameraOptical image sensor
CANController Area Network
CBRChannel Busy Ratio
CCAMCooperative, connected and automated mobility
covering a. o. autopilot, smart vehicles, automated / autonomous driving, platooning
CDDCommon Data Dictionary
cellular3G, 4G, 5G, 6G mobile communication, long range communication in IMT spectrum bands
CEDRConference of European Directors of Roads
CENEuropean Committee for Standardisation
CEN/ ISO TC 278CEN/ISO Technical Committee dealing with 
Intelligent Transport Systems (ITS)
CLChannel Load
CPMCollective Perception Message, TS 103 324
DAB+Digital Audio Broadcasting
DCCDecentralised Congestion Control – a mechanism that aims at reducing channel congestion for ITS G5 ITS-Ss
DENDecentralised Environmental Notification
DENMDecentralised Environmental Notification Message according to EN 302 637-3
Device-to-Device5G side-link enables short range direct communication between devices, e. g. vehicles, smartphones
DPDCC profile
DSRCDedicated Short Range Communication based on IEEE 802.11p
Needs to be differentiated from CEN DSRC which is the European tolling technology in 5.8 GHz
Day 1 / 2 / 3+Successive C-ITS deployment phases of use cases and technologies
EAEnrolment Authority
EALEvaluation Assurance Level
ECEuropean Commission
ECCElliptic Curve Cryptography
ECEEconomic Commission for Europe
ECDSAElliptic Curve Digital Signature Algorithm
ECIESElliptic Curve Integrated Encryption Scheme
ETSIEuropean Telecommunication Standards Institute
ETSI TC ITSETSI Technical Committee dealing with
Intelligent Transport Systems (ITS)
EU EIPEuropean ITS Platform
Functional SafetyISO 26262 Functional Safety, IEC 61508
FCWForward Collision Warning
FIPS

Federal Information Processing Standard

GalileoEuropean Global Navigation Satellite System
GBCGeoBroadcast
GDPRGeneral Data Protection Regulation (EU) 2016/679 (GDPR) 
GeofencingGeographical fence for triggering services / applications
GLONASSRussian Global Navigation Satellite System
GNGeoNetworking
GNSSGlobal Navigation Satellite System
GPSU.S. Global Positioning System
HMIHuman Machine Interface
HSMHardware Security Module
I2CarCooperative Infrastructure-to-Vehicle communication based on ITS-G5
I2VInfrastructure-to-vehicle communication
I2XInfrastructure-to-Anything communication
ICIntegrated Circuit
ICTInformation and Communication Technologies
IEEEInstitute of Electrical and Electronics Engineers
IEEE 802.11Wireless Local Area Network (WLAN), Wi-Fi, is part of IEEE 802 LAN protocols, and specifies media access control (MAC) and physical layer (PHY) protocols, communication in various frequencies, including but not limited to 2.4 GHz, 5 GHz, and 60 GHz frequency bands
IEEE 802.11pAd-hoc short-range WLAN communication specially designed for automotive application
IEEE 802.11bdEnhancing automotive WLAN standard allowing seamless interoperability of operation in channels and across channels 
IRCImpact Reduction Container
ISOInternational Organisation for Standardisation
ITSIntelligent Transport Systems and Services
ITS-AIDITS - Application Object Identifier
ITS G5European implementation of WLANp based on IEEE 802.11p or extended IEEE 802.11bd
ITS-SITS Station (might be e. g. vehicle or Road Side Unit)
IVIIn-Vehicle Information
KPIKey Performance Indicator
LandmarkFixed reference point used for positioning and navigation
LDMLocal Dynamic Map – a representation of the current environment within an ITS-S
LidarLight detection and ranging, optical sensor that measures distance to a target by illuminating the target with laser light and measuring the reflected light in three dimensions.
LTE-V2X release 14Direct peer to peer short range communication in 5.9 GHz is called sidelink, or PC5, while its long-range network based communication with LTE mobile communication in IMT bands is called Uu-link.
LTE-V2X release 15Besides others solves some issues of LTE V2X sidelink release 14 (correction of channel interleaver pattern) and few new features (higher modulation, carrier aggregation support). LTE V2X release 15 sidelink (PC5) PSSCH messages are not decodable by LTE-V2X release 14 users.
LT-RWWRoad Works Warning (long term), complex use case requiring the consideration of complementing message sets like DENM, MAP, IVI, …
M/453Mandate of European Commission to standard development organisations for developing minimum set of interoperable C-ITS standards
MAPMap message to support e.g. intersections according to ISO/TS 19091:2017
MAPEMMap Extended Message [ISO/TS 19091 2019-06]
MCOMulti-Channel Operation
NISTNational Institute of Standards and Technology
OEMOriginal Equipment Manufacturer
OSPOrganisational Security Policy
P2VPedestrian-to-Vehicle communication
P2IPedestrian-to-Infrastructure communication, e. g. to ITS-S, RSU
P2XPedestrian-to-Anything communication
PC55G direct communication between vehicle and other devices (V2V, V2I) uses so-called PC5 interface, interferes with WLANp
PCMPlatooning Control Message for truck platooning
PKIPublic Key Infrastructure
PCIPre-Crash Information
PIPerformance Indicator
PoTiPositioning and Timing 
PPProtection Profile
PrivacyC-ITS message sets like CAM and DEMN are not encrypted as all road users have to understand the messages, for avoiding long-term tracking pseudonyms and schemes for changing the pseudonyms are used
PSMPedestrian protection with Personal Safety Messages (PSM) according to SAE J2735, SAE J2945/9_201703
PTWPowered Two-Wheelers, e.g. motorcycles and scooters
Radarradio detection and ranging, electromagnetic sensor that measures relative distance and relative speed to a target
RFCRequest For Comments
RSURoad Side Unit (ITS Station)
RWWRoad Works Warning (short term)
SAESAE International - Society of Automotive Engineers
SAE 1 to 5SAE driving levels from manually to fully automated driving
SecuritySecurity in C-ITS deals mainly with trust and privacy, trust is ensured by authentication of senders and integrity protection of messages; privacy by ensuring confidentiality protection for communication with PKI
SCFStore Carry Forward
SDOStandards Developing Organisation
SHBSingle Hop Broadcast
SFRSecurity Functional Requirement
SPaTSignal Phase and Timing message of cooperative traffic lights according to ISO/TS 19091:2017
SPATEMSignal, Phase and Timing Extended Message [ISO/TS 19091 2019-06]
SSPService Specific Permissions
STSecurity Target
TAITemps Atomique International
TALTrust Assurance Level
TCTraffic Class
TCCTraffic Control Centre
TLMTrust List Manager
TMCTraffic Management Centre
Tier 1 / 2 / 3Automotive suppliers and engineering companies
TollingEuropean Electronic Toll Service (EETS) is designed to enable the payment of tolls through a single contract with vehicles in free flow condition
TOETarget Of Evaluation
TRCOTriggering Conditions
TSFTOE Security Functionality
TTCTime To Collision
TTTTransport and Traffic Telematics devices, a category in the short range device regulation
UTCCoordinated Universal Time
UWBUltra Wide Band
VAMVRU awareness message
vehiclesa. o. cars, vans, SUVs, trucks, busses, PTWs, agriculture, construction machines
VRUVulnerable Road User, e.g. (Motor-)Cyclist, Pedestrian, Blind or Impaired Persons
VRU2CarCooperative Vulnerable Road User-to-Vehicle communication based on ITS-G5
V2IVehicle-to-Infrastructure communication, e. g. to ITS-S, RSU
V2PVehicle-to-Pedestrian communication
V2VVehicle-to-Vehicle communication
V2VRUVehicle-to-Vulnerable Road User communication
V2XVehicle-to-Anything communication
VANET

Vehicular Ad-hoc Network

VCSVehicle C-ITS Station
VRUVulnerable Road User, e.g. bicyclists, pedestrians, PTW
Vision ZeroVision of traffic / mobility realisation without accidents
WAVEU.S. implementation of DSRC based on IEEE 802.11p
WGSWorld Geodetic System
WLANpOther term for ad-hoc short-range communication based on IEEE 802.11p or extended IEEE 802.11bd
X2CarCooperative Anything-to-Vehicle communication based on ITS-G5