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A red-ringed circle forbidding what its pictogram shows.
Also known as: Red ring sign, Prohibition sign shape
A red ring means the thing shown inside is forbidden. A diagonal bar is added where the pictogram alone would be ambiguous, but the ring is what carries the prohibition — which is why a speed limit sign needs no bar.
Forbids what the pictogram inside shows, the red annulus being the element that carries the prohibition.
Contexts: Road signage
Adds a diagonal bar only where the pictogram would otherwise read as a permission or an instruction, which is why numeric speed limits carry none.
Contexts: Road signage
A circle with a thick red annulus enclosing a pale field, sometimes crossed by a red diagonal bar.