When I was growing up (in the early 80's), I was big into video games (asteroids in particular). When you get a high score, you are only allowed three initials. I was dating my future wife, so whenever I found a game to get a high score on (which was often), I would use the initials TLK. Tim Loves kathy. 17 years and three kids later, I still use TLK for just about every kind of identifier.