C39 or C-39 may refer to:
== Vehicles == Aircraft Caudron C.39, a French passenger biplane Cessna C-39, an American civil utility aircraft Douglas C-39, an American military transport aircraft Ships , a County-class cruiser of the Royal Navy Surface vehicles Alfa Romeo Racing C39, an Italian Formula One car GE C39-8, a diesel electric locomotive Marshall C39, a British bus
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).