F21 or F-21 may refer to :
==Aviation== F 21 Luleå, a Swedish Air Force wing IAI F-21 Kfir, a 1973 Israeli-built all-weather, multi-role combat aircraft Lockheed Martin F-21, a variant of the F-16 designed for the Indian Air Force KAI KF-21 Boramae, a South Korean/Indonesian stealth fighter currently under development Farman F.21 Moustique II, a French interwar airplane Taylorcraft F-21, an American light aircraft
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).