USS

USS or USS is an abbreviation for:

Umpire Signaling System , a referee signaling system in the America's Cup, see International America's Cup Class #Umpire Signaling System (USS)
United Star Ship , prefix of the Star Trek Federation starship
United States Senate , the Senate of the United States
United States Ship , name prefix of US warships
United States Steel Corporation , see US Steel
Unix System Services

U _ss stands for: