HB

HB or Hb may refer to:

Media, arts and sciences

  • HB pencil (hard black), a classification of pencils

Arts and media

Music

Film and television

Academia

  • H-b index, an extension of the h-index used in determining academic impact
  • H-B Woodlawn, a secondary education program in Arlington, Virginia, US
  • Hathaway Brown School, an all-girls private school in Shaker Heights, Ohio, US

Sciences

Biology

  • Heart block, cardiovascular system disease that involves the heart's electrical conduction system
  • Hemoglobin (Hb), a group of iron-containing proteins found in most animals, whose primary function is to carry oxygen to the tissues
  • Hepatitis B, a human viral infection
  • His bundle, a specialized collection of cells in the vertebrate heart

Material properties

  • HB, a flammability rating as set forth in UL 94
  • HB, a level in the Brinell scale hardness test

Astronomy

Food, housing, politics, and drink

Places, transportation, and sports

Aviation

Rail

Automotive and sports

Player positions

Sports teams

Other uses

See also