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From Wikipedia
The numero sign or numero symbol, № (also represented as Nº, 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 17 Cherry Tree Lane" is shortened to "№ 17 Cherry Tree Ln.", yet both forms are spoken long.