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 Arzell J. Hill (September 30, 1935 – April 27, 1984),Dahl, Bill. "Z.Z. Hill" Allmusic.com. Retrieved 29 March 2014. known as Z. Z. Hill, was an American blues singer best known for his recordings in the 1970s and early 1980s, including his 1982 ...

(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 ZZ Boötis is a star system in the constellation Boötes. It varies from magnitude 6.79 to 7.44 over five days. Based on its parallax, measured by the ''Gaia'' spacecraft, it is about away. Observational history In 1950 Grigory Shajn d ...

, a star system in the constellation Boötes *

ZZ diboson ZZ dibosons are rare pairs of Z bosons. They were first observed by the experiments at the Large Electron–Positron Collider (ALEPH, DELPHI, L3 and OPAL). The first observation in a hadron collider was made by the scientists of DØ collaborati ...

, a pair of Z bosons *

ZZ Ceti Ross 548 is a white dwarf in the equatorial constellation of Cetus. With a mean apparent visual magnitude of 14.2 it is much too faint to be visible to the naked eye. Based on parallax measurements, it is located at a distance of 107 ...

, a type of pulsating white dwarf star *

G 29-38 Giclas 29-38, also known as ZZ Piscium, is a variable star, variable white dwarf star of the Pulsating white dwarf, DAV (or ZZ Ceti) type, whose variability is due to amplitude, large-amplitude, non-radial pulsations known as gravity wave ...

or ZZ Piscium, a variable white dwarf star

Other uses in science and mathematics

ZZ zinc finger In molecular biology the ZZ-type zinc finger domain is a type of protein domain that was named because of its ability to bind two zinc ions. These domains contain 4-6 Cys residues that participate in zinc binding (plus additional Ser/His residue ...

, a type of protein domain *

\mathbb

, the Zahlen symbol, representing the set of

integer An integer is the number zero (), a positive natural number (, , , etc.) or a negative integer with a minus sign (−1, −2, −3, etc.). The negative numbers are the additive inverses of the corresponding positive numbers. In the language ...

s *

Zamioculcas ''Zamioculcas'' is a genus of flowering plants in the family Araceae, containing the single species ''Zamioculcas zamiifolia''. It is a tropical perennial plant, native to eastern Africa, from southern Kenya to northeastern South Africa. Common ...

or ZZ plant, a genus of flowering plant in the family Araceae * ZZ, homogametic males under the

ZW sex-determination system The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, ...

* ZZ, homogametic males under the

ZO sex-determination system The ZO sex-determination system is a system that determines the sex of offspring in several moths. In those species, there is one sex chromosome, Z. Males have two Z chromosomes, whereas females have one Z. Males are ZZ, while females are ZO. S ...

Transportation

Isuzu Gemini ZZ/R The Isuzu Gemini is a subcompact car produced by the Japanese automaker Isuzu from 1974 until 2000. The same basic product was built and/or sold under several other names, sometimes by other General Motors brands, in various markets around the wo ...

, 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 ZZ Leiden Basketball, also known as Zorg en Zekerheid Leiden, is a basketball club based in Leiden, Netherlands. The club plays in the BNXT League, the domestic first tier league. Their home games are played at Vijf Meihal, which has 2,000 seats. ...

, 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 ''The War Games'' is the seventh and final serial of the sixth season of the British science fiction television series ''Doctor Who'', which originally aired in ten weekly parts from 19 April to 21 June 1969. In the serial, an unnamed alien r ...