Didn't we do this thread before? I forget but I tried to find it and couldn't so maybe not.
I use one of two IDs on forums. Gankaku for this one. It's a Shotokan karate kata (to test for black belt). It means "Crane on a Rock". It is my favorite kata.
The other ID I use on some forums recently is Stargazer...coz....I like gazing at stars in the sky.
(Astronomy is my hobby/interest/"wanted to be one when I grew up" thing for me.)