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A small square marking a manual alarm point.
Also known as: Manual call point symbol, Break glass point symbol
On a building services plan a manual call point is drawn as a small square at a wall position, marking where a person can raise the alarm by hand.
Denotes a manual call point at which a person can initiate the fire alarm.
Contexts: Technical drawing
Is a plan annotation and is distinct from the call point's own signage, which the catalogue holds separately among the safety signs.
Contexts: Technical drawing
A small square drawn against the wall line, sometimes containing a diagonal or a letter.
A fuller structured visual breakdown is not yet documented for this symbol.