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Numero sign

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Numero sign

The numero sign or numero symbol, (also represented as , No̱, No., or no.), is a typographic abbreviation of the word number(s) indicating ordinal numeration, especially in names and titles. For example, using the numero sign, the written long-form of the address "Number 29 Acacia Road" is shortened to "№ 29 Acacia Rd", yet both forms are spoken long.

Typographically, the numero sign combines as a single ligature the uppercase Latin letter ⟨N⟩ with a usually superscript lowercase letter ⟨o⟩, sometimes underlined, resembling the masculine ordinal indicator ⟨º⟩. The ligature has a code point in Unicode as a precomposed character, U+2116 NUMERO SIGN.

The Oxford English Dictionary derives the numero sign from Latin numero, the ablative form of numerus ("number", with the ablative denotations of "by the number, with the number"). In Romance languages, the numero sign is understood as an abbreviation of the word for "number", e.g. Italian numero, French numéro, and Portuguese and Spanish número.

This article describes other typographical abbreviations for "number" in different languages, in addition to the numero sign proper.

The numero sign's non-ligature substitution by the two separate letters ⟨N⟩ and ⟨o⟩ is common. A capital or lower-case "n" may be used, followed by "o.", superscript "o", ordinal indicator, or the degree sign; this will be understood in most languages.

In Bulgarian the numero sign is often used and it is present in three widely used keyboard layouts accessible with Shift-0 in BDS and prBDS and with Shift-3 on the Phonetic layout.

In many forms of English, the non-ligature form No. is typical and is often used to abbreviate the word "number". In North America, the number sign, #, is more prevalent. The ligature form does not appear on British or American QWERTY keyboards.

The numero symbol is not in common use in France and does not appear on a standard AZERTY keyboard. Instead, the French Imprimerie nationale recommends the use of the form "no" (an "n" followed by a superscript lowercase "o"). The plural form "nos" can also be used. In practice, the "o" is often replaced by the degree symbol (°), which is visually similar to the superscript "o" and is easily accessible on an AZERTY keyboard.

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