Later, the name hashtags, in American English this symbol #️⃣ was
alwaysbest known as the pound key. It was also known as an Octothorpe.
The first time I learned of its American naming was the classic “pound quake 3 arena” audio clip from the #quake3arena IRC channel.
“Uhhhhhh pound quake 3 arena”
“… What the hell was that?”
I use hysteresis daily… Refrigeration.