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--- abbrev_list [2025/07/02 17:52] – leb
+++ abbrev_list [2026/02/12 05:44] (current) – external edit 127.0.0.1
@@ Line 7: / Line 7: @@
 title, in an abstract, or in the body of the document.
-The RFC Editor attempts to keep the use of abbreviations consistent and
+The RFC Production Center attempts to keep the use of abbreviations consistent and
 to point out conflicts to authors.  For this purpose, we have built the
 abbreviation list below.  This list contains abbreviations appearing in
@@ Line 14: / Line 14: @@
 have multiple expansions.
-Some abbreviations are so well known that expansion is probably
+Some abbreviations are so well known that expansion is probably unnecessary. The RPC determines whether to mark an abbreviation as "well known" by considering the following:
-unnecessary.  The RFC Editor exercises editorial judgment about whether
+  * (Fairly) consistent use in RFCs
-a particular use of one of the "well-known" abbreviations requires
+  * Unique (no multiple expansions for the same abbreviation)
-expansion.  (For example, strict adherence to the expansion requirement
+  * Been around for more than a decade
-can lead to impossibly ugly titles.)  In the following list of
+  * Expected to remain well known in the future
-abbreviations, those that are usually (but not necessarily) treated as
+  * Easily found via general web search
-"well known" are marked with asterisks.  However, since there are so
+  * Commonly used in the world at large (e.g. HTML)
-many different abbreviations and there is a range of knowledge among
+  * Known more commonly by the abbreviation than the expanded form (e.g., QR code)
-RFC readers, we tend to expand abbreviations in case of doubt.
+  * Can be found in the Merriam-Webster dictionary
+An asterisk (*) in the abbreviation's row indicates that the abbreviation is usually (but not necessarily) treated as “well known”. Abbreviations that are very common outside of the RFC series might not be listed in the table.  Because there are so many different abbreviations and there is a range of knowledge among RFC readers, the RPC exercises editorial judgment about whether a particular use of one of the "well-known" abbreviations requires expansion. We tend to expand abbreviations in case of doubt.
 Finally, this list includes some terms that look like abbreviations
@@ Line 134: / Line 135: @@
 | AHS      |   | Additional Header Segment (AHS)   | |
 | :::      |   | Adaptive HTTP Streaming (AHS)   | |
+| AI       | * | Artificial Intelligence (AI)    | |
 | AIA      |   | Authority Information Access (AIA)  | |
 | AIMD     |   | Additive Increase Multiplicative Decrease (AIMD)  | |
@@ Line 252: / Line 254: @@
 | BB       |   | Bottleneck Bandwidth (BB)   | |
 | BBF      |   | Broadband Forum (BBF)   | |
+| BBR      |   | Bottleneck Bandwidth and Round-trip propagation time (BBR)  | |
 | BC       |   | Boundary Clock (BC)   | |
 | BCB      |   | Backbone Core Bridge (BCB)   | |
@@ Line 282: / Line 285: @@
 | BFR      |   | Bit-Forwarding Router (BFR)   | |
 | BGP      | * | Border Gateway Protocol  | |
 | BGP ORR  |   | BGP Optimal Route Reflection (BGP ORR)  |  |
 | BGP-LS   |   | Border Gateway Protocol - Link State  | |
 | BGPsec   |   | Typically not expanded  | |
@@ Line 357: / Line 360: @@
 | C2        |   | Command and Control (C2)   | |
 | C2P       |   | customer-to-provider (C2P)   | |
-| CA        |   | certification authority (CA)   | preferred expansion  |
+| CA        |   | certification authority (CA)   | |
 | :::       |   | certificate authority (CA)   | |
 | :::       |   | cryptographic authentication (CA)   | |
@@ Line 520: / Line 523: @@
 | CO         |   | Central Office (CO)   | |
 | :::        |   | Connection Only (CO)   | |
-| CoJP       |   | Constrained Join Protocol (CoJP)   | |
+| CoDel      |   | Controlled Delay (CoDel)  | |
+| CoJP       |   | Constrained Join Protocol (CoJP)  | |
 | COM        |   | Component Object Module (COM)   | |
 | COMEDIA    |   | Connection-Oriented Media (COMEDIA)   | |
@@ Line 605: / Line 609: @@
 | :::        |   | Current Transformer (CT)  | |
 | CT_IU      |   | Common Transport Information Unit (CT_IU)  | |
+| CTAP       |   | Client to Authenticator Protocol (CTAP)   | |
 | CTO        |   | Congestion Timeout (CTO)   | |
 | CTM        |   | Cellular Text Telephone Modem (CTM)   | |
@@ Line 619: / Line 624: @@
 | cwnd       |   | congestion window (cwnd)   | |
 | CWR        |   | Do not expand   |TCP flag bit name|
-| CWT        |   | CBOR Web Token (CWT)
+| CWT        |   | CBOR Web Token (CWT)  | |
 | d-CW       |   | DetNet Control Word (d-CW)  | |
 | DA         |   | Destination Address (DA)   | |
@@ Line 674: / Line 679: @@
 | DER        | * | Distinguished Encoding Rules   | |
 | DES        | * | Data Encryption Standard (DES)  | |
+| DET        |   | DRIP Entity Tag (DET) | |
 | DetNet     |   | Deterministic Networking (DetNet)  | |
 | DF         |   | Don't Fragment (DF)   | |
@@ Line 691: / Line 697: @@
 | :::        |   | decentralized identifier (DID)    | |
 | DIFS       |   | Distributed Interframe Space (DIFS)   | |
+| DIME       |   | DRIP Identity Management Entity (DIME) | |
 | DIO        |   | DODAG Information Object (DIO)   | |
 | DIS        |   | DODAG Information Solicitation (DIS)  | |
@@ Line 697: / Line 704: @@
 | DKIM       |   | DomainKeys Identified Mail (DKIM)   | |
 | DLC        |   | Data Link Control (DLC)  |  |
-| DLCI      |   | Data Link Connection Identifier (DLCI)  |
+| DLCI      |   | Data Link Connection Identifier (DLCI)  | |
-| DLEP      |   | Dynamic Link Exchange Protocol (DLEP)   |
+| DLEP      |   | Dynamic Link Exchange Protocol (DLEP)   | |
 | DLP       |   | Discrete Logarithm Problem (DLP)  | |
 | :::       |   | Data Loss Prevention (DLP)   | |
@@ Line 811: / Line 818: @@
 | DUT       |   | Device Under Test (DUT)   | |
 | DVB       |   | Digital Video Broadcasting (DVB)    | |
 | DVB-H     |   | Digital Video Broadcasting - Handheld (DVB-H)   | |
 | DVB-IPDC  |   | Digital Video Broadcasting - Internet Protocol Datacast (DBC-IPDC)   | |
 | DVI       | * | No expansion   | |
@@ Line 920: / Line 927: @@
 | EOF       | * | End of File (EOF)   | |
 | EOF       |   | Extended Options and Flags (EOF)    | |
+| EOL       |   | End of Options List (EOL) | |
 | EoR       |   | End-of-Row (EoR)    | |
 | :::       |   | End-of-RIB (EoR)    | |
@@ Line 993: / Line 1001: @@
 | FA        |   | forwarding adjacency (FA)   | |
 | :::       |   | Foreign Agent (FA)   | |
+| FACK      |   | Forward Acknowledgement   | |
 | FAD       |   | feature and attribute data (FAD)    | |
+| :::       |   | Flexible Algorithm Definition (FAD) | |
 | FAN ELS   |   | Fabric Address Notification Extended Link Service (FAN ELS)  | Pronounced "fan ee el es".  |
 | FARP      |   | Fibre Channel Address Resolution Protocol (FARP)  | Pronounced "farp".  |
@@ Line 1283: / Line 1293: @@
 |IIH       | | IS-IS Hello (IIH)   | |
 |IIR       | | infinite impulse response (IIR)   | |
-|IKE       | | Internet Key Exchange Protocol (IKE)  | |
+|IKE       | | Internet Key Exchange Protocol (IKE)  | "Protocol" should be used in the expansion |
-|:::       | | Internet Key Exchange (IKE)           | |
 |IKEv2     | | Internet Key Exchange Protocol Version 2 (IKEv2)  | |
 |IKM       | | input keying material (IKM)  | |
@@ Line 1326: / Line 1335: @@
 |IPBX      | | IP Private Branch Exchange (IPBX)  | |
 |IPEI     | | International Portable Equipment Identity (IPEI)   | |
+|IPComp    | | IP Payload Compression (IPComp) | |
 |IPCP      | | IP Control Protocol (IPCP)  | |
 |IPDV      | | Inter-Packet Delay Variation (IPDV)   | |
@@ Line 1465: / Line 1475: @@
 |L3SM      | | L3VPN Service Model (L3SM)  | |
 |L3VPN     |*|Layer 3 Virtual Private Network (L3VPN)  | |
+|L4S       | | Low Latency, Low Loss, and Scalable Throughput (L4S)  | |
 |L-LSP     | | Label-Only-Inferred-PSC LSP (L-LSP)  | |
 |LAALP     | | Local Active-Active Link Protocol (LAALP)   | |
@@ Line 1625: / Line 1636: @@
 |MA-L      | | MAC Address Block Large    | |
 |MA/RA     | | Maintenance Agency/Registration Authority (MA/RA)  | |
-|MAC       | | Media Access Control (MAC)  | Sublayer of the Link Layer; most frequently used in combination with "address". General guidance: When "MAC" appears in context with "address", it should be expanded in the IEEE sense.
+|MAC       | | Media Access Control (MAC)  | Sublayer of the Link Layer; most frequently used in combination with "address". General guidance: When "MAC" appears in context with "address", it should be expanded in the IEEE sense. |
 |:::       | | Medium Access Control (MAC)   | Media/Medium dependent upon plural/singular. /* Per Dan Romascanu for RFCs 5412-5418. */  |
 |:::       | | Message Authentication Code (MAC)  | Legacy cryptographic terminology |
@@ Line 1672: / Line 1683: @@
 |MDS       | | Maximal Separable Distance (MDS)   | |
 |:::       | | MetaData Server (MDS)   | |
+|:::       | | Maximum Datagram Size (MDS)  | |
 |MDSC     | | Multi-Domain Service Coordinator (MDSC)  | |
 |MDT       | | Multicast Distribution Tree (MDT)   | |
@@ Line 2137: / Line 2149: @@
 | PCO          |   | Protocol Configuration Option (PCO)   |     |
 | PCP          |   | Port Control Protocol (PCP)   |     |
+| :::          |   | Priority Code Point (PCP)   |     |
 | PCR          |   | Path Control and Reservation (PCR)   |     |
 | PCRE         |   | Perl Compatible Regular Expressions (PCRE)  |     |
@@ Line 2205: / Line 2218: @@
 | PITR         |   | Proxy Ingress Tunnel Router (PITR)   |    |
 | PK           |   | public key (PK)  | |
 | PKCE         |   | Proof Key for Code Exchange (PKCE)  | |
 | PKCS         | * | Public-Key Cryptography Standards (PKCS) | Remove the expansion if it refers to series of standards, e.g., PKCS #8 |
 | PKG          |   | Private Key Generator (PKG)   |    |
@@ Line 2270: / Line 2283: @@
 | PPTP         |   | Point-to-Point Tunneling Protocol (PPTP)   |    |
 | PQC          |   | post-quantum cryptosystem (PQC)   |   |
+| :::          |   | Post-Quantum Cryptography (PQC)   |   |
 | PR           |   | Persistent Reservation (PR)   |    |
 | PRID         |   | Push Resource ID (PRID)  |    |
@@ Line 2290: / Line 2304: @@
 | PRR          |   | Port-Range Router (PRR)   |    |
 | :::          |   | Policy Reserve Rule (PRR)   |    |
+| :::          |   | Proportional Rate Reduction (PRR)   |    |
 | PRTC         |   | Primary Reference Time Clock (PRTC)  |    |
 | PS           |   | Parametric Stereo (PS)   |    |
@@ Line 2360: / Line 2375: @@
 | RAA          |   | Re-Auth-Answer (RAA)  |    |
 | RACK         |   | Recent Acknowledgment  |    |
-| RADIUS       | * | Remote Authentication Dial-In User Service (RADIUS)  | /* Year 2006+ docs don't expand RADIUS in title */  |
+| RADIUS       | * | Remote Authentication Dial-In User Service (RADIUS)  | do not expand; more commonly known as RADIUS /* Year 2006+ docs don't expand RADIUS in title */  |
 | RAID         |   | Redundant Array of Independent Disks (RAID)  |    |
 | RAL          |   | RPL-Aware Leaf (RAL)  |    |
@@ Line 2406: / Line 2421: @@
 | RDNSS        |   | Recursive DNS Server (RDNSS)   |    |
 | RDO          |   | Route Discovery Option (RDO)   |    |
+| RDOS         |   | Reassembled Datagram Option Start (RDOS) | |
 | RDoT         |   | Recursive DoT (RDoT)   |  |
 | RDP          | * | Reliable Data Protocol (RDP)  |    |
@@ Line 2438: / Line 2454: @@
 | RIB          | * | Routing Information Base (RIB)  |    |
 | RID          |   | Real-time Inter-network Defense (RID)    |    |
+| :::          |   | Remote Identification (RID) |    |
 | :::          |   | restriction identifier (RID)  |    |
 | RIG          |   | Referral Internet Groper (RIG)   |    |
@@ Line 2451: / Line 2468: @@
 | RLDRAM       |   | Reduced Latency Dynamic Random-Access Memory (RLDRAM)  | |
 | RLE          | * | Run Length Encoding   |    |
+| RLFA         |   | Remote Loop-Free Alternate |  |
+| rLEDBAT      |   | receiver-driven Low Extra Delay Background Transport (rLEDBAT)  | |
 | RLMI         |   | Resource List Meta-Information (RLMI)   |    |
 | RLOC         |   | Routing Locator (RLOC)   |    |
@@ Line 2644: / Line 2663: @@
 | SDH          |   | Synchronous Digital Hierarchy (SDH) |    |
 | SDID         |   | Signing Domain Identifier (SDID) |    |
+| SD-JWT       |   | Selectively Disclosable JWT (SD-JWT) |
 | SDK          | * | software development kit |    |
 | SDN          |   | Software-Defined Networking (SDN) |    |
@@ Line 2691: / Line 2711: @@
 | :::          |   | session ID (SID) | |
 | :::          |   | server ID (SID)  | |
 | :::          |   | sender ID (SID)  | |
 | :::          |   | Silence Descriptor (SID)  | Per guidance, "Silence Descriptor" or "Silence Insertion Description".  The 3GPP and ETSI definition seems to be the former.  /* Ingemar Johansson (author) */  |
 |:::           |   | Silence Insertion Descriptor (SID) | |
@@ Line 2777: / Line 2797: @@
 | SP           |   | Service Provider (SP)  |    |
 | SPB          |   | Shortest Path Bridging (SPB)  |    |
-| SPBM         |   | Shortest Path Bridging MAC mode (SPBM) (IEEE 802.1aq)
+| SPBM         |   | Shortest Path Bridging MAC mode (SPBM) (IEEE 802.1aq)  |  |
 | SPC          |   | Service Provider Code (SPC)  |    |
 | :::          |   | Soft Permanent Connection (SPC) |    |
@@ Line 2826: / Line 2846: @@
 | SRTT         |   | Smoothed Round-Trip Time (SRTT) |    |
 | SRV          | * | Service Record (SRV) | Resource Record  |
-| SRv6         |   | Segment Routing over IPv6 |
+| SRv6         |   | Segment Routing over IPv6 (SRv6)|
 | SS7          |   | Signaling System 7 (SS7)  |    |
 | SS-FSSI      |   | Sender-Side FEC-Scheme-Specific Information (SS-FSSI)  |    |
@@ Line 2923: / Line 2943: @@
 | TE           | * | Traffic Engineering (TE)  |    |
 | :::          | * | Traffic Engineered (TE) |    |
+| :::          |   | Teredo extension (TE) | |
 | TEAP         |   | Tunnel Extensible Authentication Protocol (TEAP)  |    |
 | TED          |   | Traffic Engineering Database (TED) |    |
@@ Line 2946: / Line 2967: @@
 | TIAS         |   | Transport Independent Application Specific (Maximum) (TIAS) |    |
 | TIB          |   | Tree Information Base (TIB)  |    |
+| TID          |   | Traffic Classification Identifier (TID)  |    |
 | TIM          |   | Traffic Indication Map (TIM)  |  |
 | TIMIP        |   | Terminal Independent Mobile IP (TIMIP)  |    |
@@ Line 2991: / Line 3013: @@
 | :::          |   | Transport Stream (TS)  |    |
 | :::          |   | Tenant System (TS) |    |
+| :::          |   | Timestamp (TS)  |    |
+| :::          |   | Timestamps (TS) |    |
 | TSA          |   | Time Stamping Authority |    |
 | TSCH         |   | Time-Slotted Channel Hopping (TSCH)  |    |
@@ Line 3005: / Line 3029: @@
 | TSTN         |   | Temporal-Spatial Trade-off Notification (TSTN)  |    |
 | TSTR         |   | Temporal-Spatial Trade-off Request (TSTR)  |    |
+| TSval        |   | TS Value (TSval) | |
 | TT-PE        |   | Target Terminating Provider Edge (TT-PE)  |    |
 | TTD          |   | Throughput Test Device (TTD)  |    |
@@ Line 3031: / Line 3056: @@
 | :::          |   | Unavailable Seconds (UAS) |    |
 | :::          |   | Unmanned Aircraft System (UAS) | Used for both singular and plural (i.e., not "UASs")  |
+| UCB          |   | UDP Control Block (UCB) | |
 | uCDN         |   | upstream Content Delivery Network (uCDN) |    |
 | UCMP         |   | Unequal-Cost Multipath (UCMP) |    |
@@ Line 3089: / Line 3115: @@
 | USM          |   | User-based Security Model  |    |
 | USRK         |   | Usage Specific Root Keys (USRK)  |    |
+| USS          |   | UAS Service Suppliers (USS) |    |
 | UTC          | * | Coordinated Universal Time |    |
 | UTF-8        | * | Unicode transformation format 8  |    |
@@ Line 3210: / Line 3237: @@
 | WRR          |   | Weighted Round Robin (WRR)  |    |
 | WS           |   | White Space (WS) |    |
+| WS           |   | Window Scale (WS) |    |
 | WSDL         |   | Web Services Description Language (WSDL)  |    |
 | WSON         |   | Wavelength Switched Optical Network (WSON)  |    |
@@ Line 3267: / Line 3295: @@
 | ZKPP         |   | Zero-Knowledge Password Proof (ZKPP)  |    |
 | ZRTP         | * | No expansion |    |
-| ZSK          |   | Zone Signing Key (ZSK)  |    |
+| ZSK          |   | Zone Signing Key (ZSK)  | |