No symbol

Do Not Enter sign, made to the specifications of the 2004 edition of U.S. Standard Highway Signs[1] (sign R5-1).

The no symbol (also known as a prohibition sign, no sign, circle-backslash symbol, nay, interdictory circle, 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. The no symbol is generally colored red, but is sometimes another color, typically black.

单词	Prohibitory sign
释义	Prohibitory sign 英语百科 No symbol The no symbol (also known as a prohibition sign, no sign, circle-backslash symbol, nay, interdictory circle, 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. The no symbol is generally colored red, but is sometimes another color, typically black.
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Prohibitory sign

No symbol