ZW

ZW or zw may refer to:

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Science
Groups, organizations
Other uses
See also

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"