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A closed fist with the thumb up.
Also known as: Thumbs up diving, Go up signal underwater
The diving hand signal instructing a diver to ascend, made with a raised thumb.
Instructs a diver to ascend, and is an instruction rather than a suggestion.
Contexts: Public information
Does not mean approval underwater, which is the gesture's meaning on land, so a diver who signals agreement with a raised thumb has ended the dive.
Contexts: Public information
A closed fist with the thumb extended straight upward, the hand held clear of the body.
A fuller structured visual breakdown is not yet documented for this symbol.