A21, A-21 or A.21 may refer to: A road in the List of A21 roads a21, Inc., an American stock-photography company The A21 Campaign, a non-profit, non-governmental organization that combats human trafficking, slave and bonded labor, involuntary domestic servitude, and child soldiery Aero A.21, a 1920s-era Czechoslovak military aeroplane Arrows A21, a Formula One car British NVC community A21 (Ranunculus baudotii community), a plant community Focke-Wulf A 21, a photographic survey variant of the 1927 German Focke-Wulf A 17 Stearman XA-21, a twin-engine American attack bomber A21 (chess opening), a code for the English Opening in chess Astraea A21 - planned British thermonuclear warhead
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).