The difference between Number sign and Octothorpe
When used as nouns, number sign means the character used to represent the word number, whereas octothorpe means the hash or square symbol (), used mainly in telephony and computing.
check bellow for the other definitions of Number sign and Octothorpe
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Number sign as a noun:
The character used to represent the word number; the hash sign; also called the pound sign in the US
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Octothorpe as a noun (chiefly, US, typography):
The hash or square symbol (), used mainly in telephony and computing.