B9, B IX or B-9 may refer to:
==Science== Prodelphinidin B9, a plant phenolic compound Vitamin B9, another name for folic acid B-Nine WSG, a formulation of the plant growth regulator daminozide Boron-9 (B-9 or 9B), an isotope of boron A subclass of B-class stars
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).