H3

H3, H03 or H-3 may refer to:

Entertainment

Science

  • Triatomic hydrogen (H3), an unstable molecule
  • Trihydrogen cation (H3+), one of the most abundant ions in the universe
  • Tritium (Hydrogen-3, or H-3), an isotope of hydrogen
  • ATC code H03 Thyroid therapy, a subgroup of the Anatomical Therapeutic Chemical Classification System
  • British NVC community H3, a heath community of the British National Vegetation Classification system
  • Histamine H3 receptor, a human gene
  • Histone H3, a component of DNA higher structure in eukaryotic cells
  • H03, an ICD-10 code for eyelid disorders
  • *h₃, one of the three laryngeals in the reconstructed Proto-Indo-European language
  • Hekla 3 eruption, a huge volcanic eruption around 1000 BC

Computing

Transportation

Air and space

Automobiles

Ships

Rail

Roads

Other uses

See also

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