ZZ or zz may refer to: Music ZZ (band), a Japanese rock band ZZ Top, an American rock band "Zz", a silent track on the 2014 album Sleepify by Vulfpeck People Z. Z. Hill (1935–1984), an American blues singer ZZ Packer (born 1973), an American writer ZZ Ward, Zsuzsanna Eva Ward (born 1986), an American musician Science and mathematics Astronomy ZZ Boötis, a star system in the constellation Boötes ZZ diboson, a pair of Z bosons ZZ Ceti, a type of pulsating white dwarf star G 29-38 or ZZ Piscium, a variable white dwarf star Other uses in science and mathematics ZZ zinc finger, a type of protein domain , the Zahlen symbol, representing the set of integers Zamioculcas or ZZ plant, a genus of flowering plant in the family Araceae ZZ, homogametic males under the ZW sex-determination system ZZ, homogametic males under the ZO sex-determination system Transportation Isuzu Gemini ZZ/R, a subcompact car Tommykaira ZZ, a mid-engined sports car Toyota ZZ engine, a straight-4 piston engine series Kawasaki ZZ-R1200, a motorcycle Other uses ZZ Leiden, a basketball club based in Leiden, Netherlands ZZ scale, a 1:300 model railroad scale Živi zid ("Human Shield"), a political party in Croatia Zhongzhi Capital or ZZ Capital, an asset management company ZZ method, in speedcubing ZZ, the production code for the 1969 Doctor Who serial The War Games See also Sleep (disambiguation) Z (disambiguation) Zzz (disambiguation) Zzzz (disambiguation) ZZR (disambiguation)