S25 can refer to:
== Aircraft == Blériot-SPAD S.25, a French biplane Letov Š-25, a Czechoslovak biplane trainer Short S.25 Sandringham, a British flying boat airliner Short S.25 Sunderland, a British flying boat bomber Sikorsky S-25, a Russian biplane bomber Spalinger S.25, a Swiss training glider
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).