H3, H03 or H-3 may refer to:

Entertainment

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Science

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  • Triatomic hydrogen (H3), an unstable molecule
  • Trihydrogen cation (H+3), one of the most abundant ions in the universe
  • Tritium (3H), or hydrogen-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
  • Hekla 3 eruption, a huge volcanic eruption around 1000 BC

Computing

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Transportation

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Air and space

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Automobiles

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Rail

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Roads

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Ships

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Other uses

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See also

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