signage - Is there a name for the red circle and slash in a No Smoking sign?


When my daughter asked me and my husband about a No Smoking sign, we explained that it means no cigarettes are allowed. (We had to explain cigarettes to her too.)


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Unfortunately, she now thinks that the red circle and diagonal line are called a "cigarette", so she'll talk about the cigarette in the No Parking sign:


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Is there a name we can teach her for the red circle and slash?


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Answer



No symbol.



The no symbol (also prohibition sign, no sign, circle-backslash symbol, nay, or universal no) is a circle with a diagonal line through it (running from top left to bottom right), surrounding a pictogram used to indicate something is not permitted.




Trivia: There is also a popular "forward slash" version:


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