H4, H04, or H-4 may refer to:

Science and mathematics

  • ATC code H04 Pancreatic hormones, a subgroup of the Anatomical Therapeutic Chemical Classification System
  • Histamine H4 receptor, a human gene
  • Histone H4, a protein involved in the structure of chromatin in eukaryotic cells
  • Hydrogen-4 (H-4), an isotope of hydrogen
  • H4, a symmetry group in the fifth dimension; see H4 polytope
  • H-4, a huge eruption of the Hekla volcano around 2310 BC

Technology

Transport

Automobiles and roads

Aviation

Ships and submarines

Rail

Other uses

See also

  • 4H (disambiguation)
  • All pages with titles containing h-4
  • All pages with titles containing h4
  • HHhH, a novel by the French author Laurent Binet
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