[MisterTea]

> Edit: On an unrelated note, TIL that the sign used on telephone keys is also not #, but ⌗ -- a.k.a. the "Viewdata square" [0].

https://en.wikipedia.org/wiki/Telephone_keypad#Layout

"The key labeled was officially named the "star" key. The key labeled # is officially called the "number sign" key, but other names such as "pound", "hash", "hex", "octothorpe", "gate", "lattice", and "square", are common, depending on national or personal preference. The Greek symbols alpha and omega had been planned originally."

[psunavy03]

I'm now imagining an alternate world where Twitter/X introduced us to alphatags or omegatags.

[bitwize]

Twitter borrowed the # convention from IRC channel names, not telephone keypads.