Note: If I'm on vacation but online I am not ignoring my games. The reason will be something boring like I'm not well but can cope with some admin responsibilities and and am doing so, or trying to stay on top of PMs and notifications ... things like that.
If my being on vacation is ever bothersome, drop me a PM and I'll let you know as best I may what's going on and when I'll restart playing.
My current and former avatars are Celtic.
Here are some details on the older, more complex one:
It is a triquetra (purple) inside an interlaced circle and triangle. It came from Wikipedia:
More generally: https://en.wikipedia.org/wiki/Triquetra
And here, relating 'skelos' back to Greek: https://en.wikipedia.org/wiki/Triskelion
Please note that someone else entirely is @triquetra!