Good question!

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It's ba<x>sed on the Latin for the word 'Number'. The Latin word is 'Numero', so it's an abbreviation: <b>N</b>umer<b>o</b> which becomes <b>No</b> I remember this from school, a lonnnng time ago .. LOL<br />
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~F~

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To indicate a particular numerical label, the abbreviation "no." is sometimes used (deriving from "numero," the ablative case of the Latin "numerus"), as is the less common "nr.<br />
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I googled it :P

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