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In page Number sign:

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When # prefixes a number, it is read as 'number'. "A #2 pencil", for example, indicates "a number-two pencil". This usage is historically rarer in print than the abbreviation 'No.'[1], although '#' has recently overtaken 'No.' in total popularity worldwide,[1] stemming from its newfound relatively overwhelming popularity in American English[2] (but not British English[3]). In addition to 'No.' and '#', the symbol '№' or just the word 'number' are also used.[4] When used in this manner, # is often superscript, like: "a #2 pencil"[citation needed] — but typically not extending above the cap line.[citation needed]