Quat may refer to:
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Quat (surname), a Chinese surname
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Quaternary ammonium cation
In chemistry, quaternary ammonium cations, also known as quats, are positively charged polyatomic ions of the structure , R being an alkyl group or an aryl group. Unlike the ammonium ion () and the primary, secondary, or tertiary ammonium cat ...
, a class of chemical molecules used as a disinfectant, surfactant, drug etc.
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Quaternion
In mathematics, the quaternion number system extends the complex numbers. Quaternions were first described by the Irish mathematician William Rowan Hamilton in 1843 and applied to mechanics in three-dimensional space. Hamilton defined a quat ...
, a non-commutative extension of the complex numbers
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Quaternary (disambiguation), referring to four parts, divisions, or sets.
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Khat
Khat or qat ( ''ch’at''; Oromo: ''Jimaa'', so, qaad, khaad, khat or chat, ar, القات ''al-qāt'') is a flowering plant native to eastern and southern Africa. Khat contains the alkaloid cathinone, a stimulant, which is said to cause ...
, an African plant whose leaves are chewed as a stimulant
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Phan Huy Quát, former prime minister of South Vietnam
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