#TIL octothorpe is the "official" name for the number sign or #hastag (#). The etymology of the word is disputed (https://en.wiktionary.org/wiki/octothorpe) and it appears that people at Bell labs just made it up.

WORDS MEAN NOTHING AND ARE JUST NOISES AND SQUIGGLES!

The next time you complain about the youths making up words, just remember adults and companies are just as likely to do so.