No symbol
Red circle with a red diagonal line, indicating something is not permitted
No symbol
The general prohibition sign, also known informally as the no symbol, "do not" sign, circle-backslash symbol, nay, interdictory circle, and the prohibited symbol, is a red circle with a 45-degree diagonal line from upper left to lower right inside the circle. It is typically overlaid on a pictogram to warn that an activity is not permitted, or has accompanying text to describe what is prohibited. It is a mechanism in graphical form to assert "drawn norms", i.e. to qualify behaviour without the use of words.
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