ZZ

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

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

Molecular biology

 * ZZ zinc finger, a type of protein domain
 * ZZ, homogametic males under the ZW sex-determination system
 * ZZ, homogametic males under the ZO sex-determination system

Other uses in science and mathematics

 * Zamioculcas or ZZ plant, a genus of flowering plant in the family Araceae
 * $$\mathbb{Z}$$, the Zahlen symbol, representing the set of integers

Vehicles

 * 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
 * Zz (digraph), a digraph in the Latin alphabet