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 inside the circle from upper-left to lower-right. It is typically overlaid on a pictogram to warn that an activity is not permitted, or has accompanying text to describe what is prohibited.
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 inside the circle from upper-left to lower-right. It is typically overlaid on a pictogram to warn that an activity is not permitted, or has accompanying text to describe what is prohibited.
Source: Wikipedia "No symbol" · CC BY-SA 4.0
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