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A circle carrying a letter code.
Also known as: Room stat symbol, Temperature control symbol
The services drawing symbol for a thermostat, drawn as a circle carrying a letter identifying the control function.
Marks a thermostat on a services drawing.
Contexts: Technical drawing
Uses the same lettered circle as instrument symbols on a process diagram, so a services drawing borrows a convention from a wholly separate discipline.
Contexts: Technical drawing
A small circle drawn on the room plan carrying one or two letters inside it.