ZW or zw may refer to:
==Science== ZW sex-determination system, chromosomal in birds and some species of reptile, fish, and insect ZW, heterogametic genetic female designation under this system Zettawatt (), an SI unit of power, 10+21 watts Zeptowatt (), an SI unit of power, 10-21 watts Zwicky Catalogue (abbreviated: ), the "Catalogue of Galaxies and of Clusters of Galaxies"
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).