Map prefixes and suffixes

Common traditional naming conventions for maps for some GoldSource 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. In addition, some custom maps are marked with unofficial prefixes, either to denote its nature or to brand it.

Todo: Add descriptions and prefix names for those who do not have any.

Official Games

Counter-Strike, Counter-Strike: Condition Zero, Counter-Strike: Source, and Counter-Strike: Global Offensive

Prefix	Map Type	Description
Official (general)
cs	Hostage Rescue	In Counter-Strike: Global Offensive, maps with this prefix will show Hostage Scenario Mission in the loading screen.
de	Bomb Defusal, Arsenal: Demolition and Wingman	In Counter-Strike: Global Offensive, maps with this prefix will show Bomb Scenario Mission in the loading screen.
Official ( Counter-Strike, Counter-Strike: Condition Zero, and Counter-Strike: Source)
as	Assasination	Counter-Strike and VIP Mod only
es	Terrorist Escape	Now defunct, originally official
tr	Training Maps	Only official appearance in Counter-Strike 1.5 retail.
Official ( Counter-Strike: Global Offensive)
ar	Arsenal: Arms Race	For game mode descriptions, see CS:GO Game Mode Commands.
coop	Co-op Strike Scenario
dz	Danger Zone
gd	Guardian Scenario
Unofficial
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
bhop	Bunny Hop Maps
cp	Control Points
dm	Deathmatch Arena	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.
dr	Dead Run	Race mod (unofficial gamemode)
fy	Frag Yard / Fight Yard	Map with an assortment of weapons spawning on the ground versus player inventory.
fun	Fun Map	Map with some strange objectives, contraptions or other mysterious things.
mg	Minigames	Mostly obstacle courses and maps that feature a wide selection of smaller games.
gg	Gun Game (Original Arms Race)	The only objective on this map is to kill the other team. You can level up to get better guns.
he	Heavy Explosive Grenade Arena	Restricts players to Heavy Explosive grenades.
nade
hg	Hunger Games	Usually big maps with weapons scattered around the arena. Last man standing wins the round.
ka	Knife Arena	Restricts players to knives only.
kz	Kreedz Climbing
pa	Prepared Assault
jb	Jailbreak
rp	Roleplaying	Mod only available on community servers.
surf	Surf Maps	Surf Maps (unofficial gamemode).
texture	Secondary prefix	Denotes a map that only uses dev textures.
ze	Zombie Escape	Zombie mod escape maps (unofficial gamemode)
zm	Zombie Mod	Zombie mod barricade maps (unofficial gamemode)

Note: Counter-Strike: Condition Zero uses enhanced versions of the original Counter-Strike maps, denoted with a "_cz" suffix.

Day of Defeat and Day of Defeat: Source

Prefix	Map Type	Description
dod	Default Prefix
para	Para Maptype	Last seen in Day of Defeat beta 3.1

Alien Swarm

Prefix	Map Type	Description
asi	Default Prefix
jac#	?	Second prefix assigned to the above. Used in missions, where the hashtag defines a number for the Jacob's Rest campaign.

Deathmatch Classic

Prefix	Map Type	Description
dmc	Default Prefix	This is the default prefix for all maps in Deathmatch Classic.

Half-Life

Prefix	Map Type	Description
c0	Chapter 0	Train Ride
c1	Chapter 1	Black Mesa Sectors
c2	Chapter 2	Black Mesa Trainride
c3	Chapter 3	Black Mesa Outside
c4	Chapter 4	Xen
c5	Chapter 5	Ending
t0	Training	Training Maps
hldemo	Demo Maps	Originally found in Half-Life: Uplink

Half-Life: Blue Shift

Prefix	Map Type	Description
ba	Default Prefix	This is the default prefix for all of the game's maps.

Half-Life: Opposing Force

Prefix	Map Type	Description
of	Default Prefix
op4cp	Capture Point
op4ctf	Capture The Flag