Gambling (GURPS) is one of Fallout GURPS skills. See: Fallout GURPS.
The skill of playing games of chance. A successful Gambling roll can tell you if a game is rigged, identify a fellow gambler in a group of strangers or estimate the odds in a tricky situation.”— Steve Jackson Games GURPS sources
With the abandonment of GURPS, Gambling (GURPS) was recycled into Gambling.