You're right. I normally use <abbr> for that, but I forgot this time. I'll fix it.

COP: Coefficient of Performance.

PV: Photovoltaic.

EV: Electric Vehicle.

TMDA: Too Many Damn Acronyms (It's a joke I heard at a company that had acronyms for everything).

We name different projects after Greek Gods + acronyms. The names can be pretty fun.

"Where's Dionysus' Project Manager?"

"In a bar, somewhere.."

Well, a TLA is a TLA, but an FLA is not an FLA (it is also a TLA)...

It depends. Facing each other, when one says "to the right", does he mean to his right or to the interlocutor's right?

Furthermore, Are RFCs TLA? It appears that IANA, an FLA itself, standardized the use of TLAs in an RFC.

https://tools.ietf.org/html/rfc5513

ETLA is a FLA.

DETLA is also a FLA.