R4, R04, R.4, R-4, or R/4 may refer to:
R4, R04, R.4, R-4, or R/4 may refer to:
==Military== ===Aircraft=== Caudron R.4, World War I French reconnaissance aircraft, first flown in 1915 Curtiss R-4, air ambulance version of the American Curtiss Model R utility aircraft, first flown in 1915 Sikorsky R-4, American helicopter, first flown in 1942
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).