H2

 
Pronunciation: /eɪtʃ/

abbreviation

  • hard (used in describing grades of pencil lead): a 2H pencil
  • height (in giving the dimensions of an object): H 195 cm by W 107 cm by D 52 cm
  • Physics henry(s).
  • informal heroin: ‘Tell me it’s not heroin.’ ‘It’s not H’
  • Hungary (international vehicle registration).
  • British (on signs in the street) hydrant.

symbol

  • Chemistry enthalpy.
  • the chemical element hydrogen.
  • Physics magnetic field strength.