Used to prevent actions for safety reasons, often in aviation or boating contexts.

Safety Signal

Involves physical movement, such as hand waving, to give a clear visual cue.

Physical Gesture

Can be used to gently refuse an offer without hurting someone's feelings.

May convey that the suggestion is not necessary or not worth considering.

In sports, implies a quick and decisive cancellation of a play or decision.

The official's clear physical signal ensures all players and spectators understand the call.

Emphasizes the authority of referees or officials in enforcing rules during a game.