Dosh is the fictional currency of Killing Floor 2. While reference is made to dosh throughout the original game, Killing Floor, it does not appear as its own form of currency; it is only used as a casual or slang reference to the actual currency used, the British pound.
In Killing Floor 2, Dosh has received its own unique monetary symbol and is received after killing enemies, where it may be redeemed in the form of weapons, ammunition, body armor, and grenades at the active trader station between rounds.
The Dosh Vault is a feature in Killing Floor 2 allowing players to visually accrue Dosh onto large palates in a warehouse by completing Daily and Weekly Challenges.
As stated in Mr. Foster's bio on the official Killing Floor 2 website, his birth sign (zodiac symbol) is Dosh.