a16z, l10n, s11n,
Or without numbers,
authC/authN, authZ...
I work in this area and even I don’t know what AuthC is!
They are absurd abbreviations. The first distinguishing letter comes right after auth, so ... let's hide it?
The other fun thing is that authC and authZ sound identical for certain accents
The kicker for me recently was hearing someone say "ally"