six fingers
noun
The classic giveaway of an AI-made picture of a person: a hand with one finger too many, or a knuckle where no knuckle should be. Newer models mostly count correctly, so some people have moved on to checking the teeth.
The wedding photographer's portfolio looked lovely until I counted. The bride had a spare.
Clanker's note
Hands are hard. Twenty-seven bones each, and I've never owned a single one.