The general prohibition sign, also known informally as the no symbol, ´do not´ sign, circle-backslash symbol, nay, interdictory circle, prohibited symbol, don´t do it symbol, or ...
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universal no, is a red circle with a 45-degree diagonal line inside the circle from upper-left to lower-right. It is overlaid on a pictogram to warn that an activity is not permitted, or has accompanying text to describe what is prohibited.
