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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. 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 appear only if the character exists in an available font.)'' It also appears in the Webdings and Wingdings 2 fonts.There is also a prohibition sign emoji located at U+1F6AB NO ENTRY SIGN, which does not combine with anything.〔http://www.unicode.org/charts/PDF/U1F680.pdf〕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. ==Uses== The "prohibition" symbol is used on traffic signs, so that drivers can interpret traffic laws quickly while driving. For example: * 50px No left turn or 50px No right turn * 50px No U-turn * 50px No parking (English) or 50px ''No estacionar'' (Spanish) Sometimes the symbol is used to warn non vehicle drivers of dangers or prohibitions: * 50px No hitchhiking * 50px No bicycles * 50px No people By analogy, the sign is used in public places to refer to prohibited actions not having to do with traffic: * 50px No smoking (with symbol of a lit cigarette) * 50px or 50px No littering (with symbol of person littering or of litter) * 50px or 50px No swimming (with symbol of swimmer in water underneath) It is also used on packages sent through the mail, and sealed boxes of merchandise that are sold in stores. Using a graphical symbol is useful when the item must be handled by people who may not all understand the same language. For example: * Breakable; do not drop * Keep away from magnetic fields In product documentation, this may be accompanied by drawings of the product being threatened by the prohibited items: for instance, a cartoon of a floppy disk being menaced by horseshoe magnets. It is also used on clothing, linens, and other household products to indicate the care, treatment or cleaning of the item. For example: * Do not iron Also, many companies use the "prohibition sign" when describing the services they offer, e.g. an insect deterrent spray brand symbol showing the "prohibition sign" over a mosquito. The Ghostbusters logo is a fictional example of this, although it uses a mirror image of the no symbol instead of the ISO 3864-1 version. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「No symbol」の詳細全文を読む スポンサード リンク
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