- HL
HL is an abbreviation for:
*Half-life (radioactive decay)
*"Half-Life (series) ", a video game series
**"Half-Life", the first game in that series
*Hangars Liquides , an electronic music label
*Headline
* a condition of congruence in right angles
*Hectolitre , 100 liters
*Herman Li , Guitarist for the power metal band DragonForce
*"Higher Level", a level of course difficulty in theInternational Baccalaureate Diploma Programme
*Hit list
*Hitachi-LG Data Storage (also abbreviated HL-DL-ST), a joint venture between Hitachi and LG, mainly producing optical disc drive.
*Hotline
*House of Lords
*Hovedstadens Lokalbaner , a Danish local railway company
*South Korea (amateur radio call sign prefix assigned to the country)
*Horseland Hl is
abbreviation for:*
Hydrogen line
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