B21 may refer to:
==Places== Kepong–Selayang Highway (Selangor state route B21), Malaysia Autovía B-21, Spain; a motorway Harumi Chūō (station code B21), Tokyo BRT, Tokyo, Japan Mikamo Station (station code B21), Higashimiyoshi, Miyoshi, Tokushima, Japan; a train station Shin-Hōsono Station (station code B21), Seika, Kyoto, Japan; a train station Sugarloaf Regional Airport (FAA airport code B21), Franklin County, Maine, USA
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).