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A closed fist with the thumb down.
Also known as: Thumbs down diving, Go down signal underwater
The diving hand signal instructing a diver to descend, made with a lowered thumb.
Inverts the ascend signal exactly, so the pair uses one gesture and its opposite for the two directions that matter most.
Contexts: Public information
A closed fist with the thumb extended straight downward, the hand held clear of the body.
A fuller structured visual breakdown is not yet documented for this symbol.