I took a civil service test today to get a job in the university library system. The last 5 questions on the test came with a handout explaining a 5-digit system for classifying materials in the u's library system. At first it looked kinda crazy to me, but after a moment it clicked: Hot damn, this is just like a UWP!
For those of you not in the know, every world in Trav has a seven digit number that packs all the key data into a small package. This number is called the Universal World Profile. For example, if I were to say that the planet Restubuss IX has a UWP of C5558F9-9 you'd know that you were dealing with a medium-sized world that's home to a billion people living under the thumb of middling-tech space nazis.
This library classification was the same deal. So while other folks taking the test might have been scrambling to wrap their brain around the concept, I already had a working knowledge of the basic scheme. I was the first guy done with the test and out the door. I usually hate that guy, but this time I got to be that guy.