HL

HL is an abbreviation for:

  • Half-life, radioactive decay
  • Half-Life (series), a video game series
    • Half-Life (video game), the first game in that series
  • Hangars Liquides, an electronic music label
  • Headline
  • Hypotenuse Leg, a condition of congruence in right angles
  • Hectolitre, 100 liters (as hl or hL)
  • Herman Li, guitarist for the power metal band DragonForce
  • Higher Level, a level of course difficulty in the International Baccalaureate Diploma Programme
  • Hit list (disambiguation)
  • Hitachi-LG Data Storage (also abbreviated HL-DL-ST), a joint venture between Hitachi and LG, mainly producing optical disc drive
  • Hotline
  • Hodgkin's lymphoma, a highly treatable hematological malignancy ("blood cancer")
  • Hospitality Lawyer, a hospitality resource website founded by Stephen Barth
  • Houlihan Lokey, a leading international investment bank
  • House of Lords
  • Hovedstadens Lokalbaner, a Danish local railway company
  • South Korea (amateur radio call sign prefix assigned to the country)
  • Horseland
  • Hydrogen line
  • Highlighter
  • Voiceless alveolar lateral fricative (frequently written as "hl" or "ɬ")
  • Hugh Laurie, actor
  • Hargreaves Lansdown, British investment company

Miscellaneous:

  • hl is the label of an argument in Google web addresses specifying the interface language ('host language') the Google web page should be in.