In a way it's like asking why is socker called football. In English speaking countries outside the United States the pound sign is call a hash. The hash combined with the word that follows it are called a hashtag.
The pound sign is also known as the hashtag symbol or the number sign. It is represented by the symbol "#" and is commonly used in social media to categorize content or indicate a topic.
#LMGTFY The '#' symbol, known as the "hashtag", "number sign", or "pound sign" is the single line comment character.
A hashtag is the pound sign that is followed by a word or phrase.
Most people just say "pound," but you can also just say "hashtag" (thanks to Twitter,) but you can always just say number sign.
pound sign or hashtag
The scientific name for the number sign "#" is octothorpe.
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The Pound Sign Is This £
The name of the symbol is "pound sign" or "number sign". It is also known as an "octothorpe" or "hash symbol".
The Pound Sign Is This £
The Pound Sign Is This £
The pound sign, also known as the number sign, gained the name "pound sign" because it was used as a symbol for the unit of weight (lbs) in the United States. Additionally, in the UK, the term "pound sign" is commonly used to refer to the symbol £, which represents the British pound currency.