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API (disambiguation)
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==In science and technology== *[[Active pharmaceutical ingredient]], a basic component of any medicine or pharmaceutical drug *[[Blowback_(firearms)#Advanced_primer_ignition_.28API.29_blowback|Advanced primer ignition]], a type of blowback operation for firearms that ignites the primer when the bolt is still moving with the goal of increasing rate of fire and decreasing felt recoil. *Petroleum industry nomenclature deriving from American Petroleum Institute **[[API gravity]], a measure of the density of petroleum **[[API number]], a unique identifier applied to each petroleum exploration or production well drilled in the United States **API unit, a standard measure of natural gamma radiation measured in a borehole *[[Analytical Profile Index]], a miniaturized panel of biochemical tests compiled for identification of groups of closely related bacteria *[[API oil-water separator]] *[[Air Pollution Index]], a measure of air quality used in Hong Kong and Malaysia *[[Armor-piercing incendiary]], a type of armor-piercing shot and shell *[[Atmospheric pressure ionization]], a type of ionization in mass spectrometry *[[Apnea–hypopnea index]], an index used to indicate the severity of [[sleep apnea]]
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