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Numero sign - Wikipedia
The numero sign or numero symbol, № (also represented as Nº, No̱, No., or no.), [1][2] 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 ...