Map prefixes and suffixes
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Common traditional naming conventions for maps for some Half-Life and Source games use a small prefix (often two or three letters) followed by an underscore at the beginning of the map name. For example "de_dust", where "de_" is the prefix and "dust" is the map name.
Official prefixes are as follows.
Official games
Counter-Strike, Source & Condition Zero
- as - Assassination (Counter-Strike and VIP Mod only)
- cs - Hostage Rescue
- de - Bomb Defusal
- es - Terrorist Escape (now defunct, originally official)
- tr - Training maps. Only official appearance in Counter-Strike 1.5 retail.

Day of Defeat & DOD:S
- dod
- para - Para gametype map (last seen in DOD beta 3.1)
Deathmatch Classic
- dmc
Half-Life
- c0
- c1
- c2
- c3
- c4
- c5
- tr - Training room
- hldemo - Half-Life: Uplink
Half-Life Blue Shift
- ba
Half-Life Opposing Force
- of
- op4cp
- op4ctf
Half-Life Decay
- ht
- dy - Prefix used by Decay PC mod
Half-Life 2, Half-Life 2: Episode 1, Half-Life 2: Episode 2
- d1 - Half-Life 2, Day one of the story
- d2 - Half-Life 2, Day two of the story
- d3 - Half-Life 2, Day three of the story
- ep1 - Half-Life 2: Episode 1
- ep2 - Half-Life 2: Episode 2
Half-Life 2: Deathmatch
- dm
Left 4 Dead
- l4d - Co-op mode
- l4d_vs - Versus mode
- l4d_sv - Survival mode
Portal
- testchmb
- escape
Ricochet
- rc
SiN Episodes: Emergence
- arena
- se1
Team Fortress 2
- arena - Arena
- cp - Control Point
- ctf - Capture the Flag
- tc - Territorial Control
- pl - Payload
- plr - Payload Race
Third-party mods
VR; Origin
- tier0 Tier 0 maps
- tier1 Tier 1 maps
- tier2 Tier 2 maps
- tier3 Tier 3 maps
- tier4 Tier 4 maps
Brain Bread
- bb
D.I.P.R.I.P.
- diprip
Dystopia
- dys
- pb
Empires
- emp
Eternal Silence
- es
Fortress Forever
- ff - All gametypes
Garry's Mod
-- Official --
- gm
- gmdm - Garry's Mod Deathmatch
- mr - Melon Racer
- ifn - Infection (unreleased test gamemode)
-- Unofficial --
- rp - Roleplay
- sb - SpaceBuild
- gms - Stranded
- zs - Zombie Survival
- fw - Fort Wars
Gunman Chronicles
- demo - Gunman Chronicles demo
- cinematic - cutscene
- city
- mayan
- rust
- west
- rebar
Half-Life 2: Capture The Flag
- ctf - Capture the Flag
- dom - Domination
Hidden: Source
- hdn - Hidden
- ovr - Overrun
Insurgency
- ins
Iron Grip: The Oppression
- ig
Jailbreak
- jb
Natural Selection
- co - Combat
- ns - Natural Selection (original)
Project Valkyrie
- 3mm - 3-Month Mod
Sourceforts
- sf
Specialists, The
- ts
Sven Co-op
Older Sven Co-op maps tend not to have prefixes, but, to stop confusion with third-party single player levels and original Half-Life multiplayer add-ons, the "sc" prefix has come into use.
- sc
Synergy
- syn
Zombie Master
- zm
Zombie Panic, Zombie Panic! Source
- zps
- zpo
- zpl
Unofficial prefixes
In addition, some custom maps will be marked with unofficial prefixes, either to denote its nature or to brand it.
Unclassified
- aaa
- jp
- kz - Climing/jumping
- nrp
- proto - Prototype map
- rwp
- sa - Snipers Alley
- sp - Single player
- sdk - SourceSDK example map
- test - Test map
Counter-Strike, Source & Condition Zero
- aim - Aim Arena has teams that are restricted to one class of weapon and have no objectives except to eliminate the opposing team. Emphasis is placed on player's aim.
- awp - AWP Arena restricts players to AWPs only
- dm - Deathmatch Arena-styled maps used by deathmatch mods for CS and CS:S. These maps are usually small and simple like "fy" maps but adapted in order to have multiple spawn points.
- fy - Frag Yard is a map with an assortment of weapons spawning on the ground versus player inventory.
- fun - Fun Map is a map with some strange objectives, contraptions or other mysterious things.
- gg - Gun game. The only objective on this map is to kill the other team. Weapons are usually bought.
- he - HE Grenade Arena restricts players to Heavy Explosive grenades.
- ka - Knife Arena restricts players to knives only.
- pa - Prepared Assualt
- surf - Surf Maps (unofficial gamemode)
- texture - Secondary prefix. Denotes a map that only uses dev textures.
- ze - Zombie mod escape maps (unofficial gamemode)
- zm - Zombie mod barricade maps (unofficial gamemode)
Half-Life 2: Deathmatch
- js - coop
Team Fortress Classic
- conc - "Conc" maps, using concussion grenades to do a climb/jump sort of map.
Team Fortress 2
- ccp - Cyclic Capture Point
- dm or duel - Death Match or Duel
- dom - Domination
- es - Escort
- koth - King of the Hill
- jump - Jump maps (rocket or stickey jumping)
- melee - Melee only map
- sniper - Sniper only/prefered map
- toy or rats - Players are small compaired to the level scale
- rc - A Capture Point match where the points are randomly assigned
- vip - Hunted map, to be used with the Hunted Mod
Thematic
- killbox - Killbox (DM) is a map consisting of at least one box-shaped arena.