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A finger raised to lips, or a struck-through speaker, marking a silent area.
Also known as: Silent carriage, Quiet coach, Finger on lips symbol
A finger to the lips marks a quiet zone. Unlike most prohibition signs it asks rather than forbids, and the drawing reflects that — it is a person requesting quiet rather than a struck-through object.
Marks an area where passengers or visitors are asked to keep noise to a minimum.
Contexts: Public information
Asks rather than forbids, which is why it is usually drawn as a person requesting quiet rather than as a struck-through object in a red circle.
Contexts: Public information
A head shown in outline, in profile or front view, with a single raised index finger held vertically as a straight line against the lips.
A fuller structured visual breakdown is not yet documented for this symbol.