It’s gone by many names, (the pound sign, the number sign, the octothorpe and the hashtag symbol) and it’s had many meanings, but what is the origin of this # mysterious symbol?

The USPTO examines applications for hashtag-fashioned marks in the same manner as any other mark. Therefore, a hashtag preceding an otherwise unregistrable term, phrase, or symbol will not be ...

Chris Messina, inventor of the Twitter hashtag. Chris Messina / LinkedIn Chris Messina, the former Google designer who first proposed that Twitter adopt the hashtag — or "pound" symbol, as it ...