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The no symbol (also prohibition sign, circle-backslash symbol, 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 usually colored red.
The Unicode code point for the prohibition sign (also called the no symbol) is U+20E0;, Combining Enclosing Circle Backslash ( ⃠). It is a combining character, which means that it appears on top of the character before it, so putting d⃠ will show d⃠. (Note: This will only appear if the characters exists in an available font.) It also appears in the Webdings and Wingdings 2 fonts.
According to the ISO standard (and also under a UK Statutory Instrument), the red area must take up at least 35% of the total area of the sign within the outer circumference of the "prohibition sign". So 35% of everything within the outer edge of the "no symbol" must be the symbol itself. Additionally for printed signs under the UK rules, the width of a "no symbol" is set at 80% the height of the area it is printed to.