AP kind of has 2 meanings.
1. Acetyl Pyrazine, which is used as a flavoring.
2. Acetyl Propionyl which is one of the "baddies" used in flavorings that gives it a buttery note. Some see it as an inhalation concern, others are not as worried about it.
TFA - The Flavor Apprentice (also known as The Perfumer's Apprentice - same company) They do have some labels that are written as Fa (capital F lowercase A, and is easily confused with the abbreviation for FlavourArt, which is FA - both capitalized.
TA - Tobacco Alkoloids, some use this when weaning from cigarettes, I don't know much about this at all.
RF - the only RF I know of is radio frequency, so hopefully someone else can help you with that one, lol.
FA - as mentioned, is FlavourArt
INW (some use IA) is Inawera
CAP - Capella's
FLV - Flavorah
FE Flavor Express
NF - Nature's Flavors
FW - Flavor West
The above are abbreviations in the DIY juice areas. When we get to talking about gear, like tanks, mods, coils, drip tips, ways of inhaling.... there are a LOT more abbreviations, LOL You're not "thick", it's a lot to keep up with! It's as if we've developed out own language.
Welcome to the forum Flavour Chaser!