PNA or Pna has a variety of meanings:
==Science and engineering== abbreviation for orchid genus Paphinia Pacific–North American teleconnection pattern, a climatic phenomenon Parisiensia Nomina Anatomica, the revision of anatomic nomenclature Peanut agglutinin, a lectin specific for Gal-β(1–3)-GalNAc Peptide nucleic acid, an artificially synthesized polymer similar to DNA or RNA. Plastic neutral axis, an engineering value used in plastic section modulus Pottery Neolithic A, a division of the Pottery Neolithic period in archaeology
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).