I don't know
Asymmetric, Closed shape, Colorful, Contains both straight and curved lines, Has no crossing lines.
Category: Diver Communication Symbols.
More symbols in Hand Signals:
Hand signals are generally used when visibility allows, and there are a range of commonly used signals, with some variations. These signals are often also used as an alternative by professional divers read more »
More symbols in Diver Communication Symbols:
Diver communications are the methods used by divers to communicate with each other or with surface members of the dive team. read more »