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Why is underscore allowed in hashtags(e.g #hello_world) but not dash(e.g #hello-world)?

And why don't Twitter and other applications allow digit-only hashtags e.g #123? [Edit: got the answer to this in response]

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The octothorpe/hash (#) symbol has been considered the symbol for "number" way before it was used for tagging in social media. "#1" has always been "number one". If Twitter allowed numeric-only hashtags, people would write things like "#123" to mean "number 123" but Twitter would mistakenly consider it as a hashtag.

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    Perhaps this is the same reason for no dashes? #123-456-1232, both numbers and dashes are commonly used in phone numbers – DasBeasto Aug 10 '16 at 13:01

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