H3

H3 or H-3 can refer to:

H3 (chemistry), a pyrotechnic composition
Interstate H-3
H-3 Sea King, a U.S. Navy helicopter
Hummer H3, the smallest of the 3 Hummer models sold by General Motors
Harrison Number Three, an 18th century chronometer designed by John Harrison
Hash House Harriers
Histone H3, a component of DNA higher structure in eukaryotic cells
British NVC community H3, Ulex minor - Agrostis curtisii heath, one of the heath communities of the British National Vegetation Classification
Protonated molecular hydrogen, H₃⁺, one of the simplest polyatomic molecules

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