mushi-ken; Japanese rock-paper-scissors variant using frog, snake, and slug hand gestures
Historical hand game; the thumb represents the frog, the forefinger the snake, and the little finger the slug. Frog beats slug, slug beats snake, snake beats frog.
Mushi-ken is a type of hand game that was popular in the Edo period.
In mushi-ken, the thumb represents the frog, the forefinger the snake, and the little finger the slug.
From 虫 (mushi, 'insect, bug') + 拳 (ken, 'fist; hand game'). The name refers to the animal-themed gestures used in the game.