Rezarf
Hard Core 4+
Ok, let's see. Jacket started as an abbreviation for YellowJacket from my old days hanging out on college basketball discussion boards (I went to school in ACC country). I tried to leave it behind at some point, but then I decided I liked the double-meaning of the word in an outdoorsy sense. And I like the fact that it's not a random bunch of letters and numbers and is easy to remember and associate. And I've never come across a place where "jacket" was already in use.
So Jacket it is...
Go Jackets! [insert Buzz smiley here]