Heh, you actually highlight a funny frustration from my time there: TLES technically has a capital "S" too, but it's basically always discussed in the plural -- so I would very frequently forget to capitalize the "S" to the veterans' chagrin. Clearly, I haven't shaken the habit!

In hindsight, I guess it's the industry's fault for not pronouncing it "Tee Ell Eee Esses"...

EDIT: And I appreciate the explanation, personally! That's the best part of HN. To be clear to passers-by, a TLES is a string of characters that describes the orbit of a single satellite (artificial or otherwise) based on its position & momentum at some given start second. They have to be updated pretty frequently to account for gradual stochastic drift, which is both an interesting technical problem and a compelling philosophical metaphor.