PCB may refer to:
==Science and technology== Polychlorinated biphenyl, an organic chlorine compound, now recognized as an environmental toxin and classified as a persistent organic pollutant Printed circuit board, a board used in electronics Plenum chamber burning, in some jet engines Papillary carcinomas of the breast, rare forms of the breast cancers
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).