TLA Will always mean Three Letter Acronym in my book. It took many link hops to find an actual definition, I finally found it in Leslie's first paper on the subject. PEYA, people! Please Explain Your Acronyms!
Such as the TLA (three letter acronym) used here.
I mean, it's spelled out right there in the post so what's the complaint? And I double checked, that's copied from the email on Tuesday so not a later addition. He does seem to have changed it on the page for people who don't want to read so now the T, L, and A in the words are capitalized and bolded.
Pythonistas, feh!