HL may refer to:

In arts and entertainment

* ''Half-Life'' (series), a video game series by Valve ** ''Half-Life'' (video game), the first game in that series * ''

Horseland Horseland was an online community and browser game where members took care of, bred, trained and showed horses and dogs. Begun in 1994 in the United States, Horseland had grown to have more than 8 million users who played from all over the world. ...

'', an online community and virtual game * '' Harry Styles'' and '' Louis Tomlinson'', part of the popular boyband ''

One Direction One Direction, often shortened to 1D, are an English-Irish pop boy band formed in London in 2010. The group are composed of Niall Horan, Liam Payne, Harry Styles, Louis Tomlinson, and previously Zayn Malik until his departure from the g ...

'' known as HL when referred to together

Businesses

* Hangars Liquides, an electronic music label * Hargreaves Lansdown, a British investment company *

Hitachi-LG Data Storage Hitachi-LG Data Storage (HLDS, HL-DT-ST or H-L Data Storage), a joint venture between Hitachi and LG, is a manufacturer of DVD and Blu-ray The Blu-ray Disc (BD), often known simply as Blu-ray, is a digital optical disc data storage form ...

, an optical disc drive manufacturer *

Hogan Lovells Hogan Lovells is an American-British law firm co-headquartered in London and Washington, DC. The firm was formed in 2010 by the merger of the American law firm Hogan & Hartson and the British law firm Lovells. It employs about 2,400 lawyers a ...

, an international law firm *

Houlihan Lokey Houlihan Lokey, Inc., is an American multinational independent investment bank and financial services company. Houlihan Lokey was founded in 1972 and is headquartered at Constellation Place in Century City, Los Angeles, California. The firm adv ...

, an international investment bank * Hovedstadens Lokalbaner, a Danish local railway company

In linguistics

* , a Latin-script digraph * Reduction of /hl/ to /l/ in Old/Middle English *

Voiceless alveolar lateral fricative The voiceless alveolar lateral fricative is a type of consonantal sound, used in some spoken languages. The symbol in the International Phonetic Alphabet that represents voiceless dental, alveolar, and postalveolar lateral fricatives is , ...

, a sound sometimes represented as

Science, technology, and mathematics

* HL gas, a mixture of sulfur mustard and lewisite *

Half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable at ...

, in nuclear physics *

Hectolitre The litre (international spelling) or liter (American English spelling) (SI symbols L and l, other symbol used: ℓ) is a metric unit of volume. It is equal to 1 cubic decimetre (dm3), 1000 cubic centimetres (cm3) or 0.001 cubic metre (m3). ...

, a unit of volume *

Hessdalen light The Hessdalen lights are unidentified lights observed in a stretch of the Hessdalen valley in rural central Norway. Background The Hessdalen lights are of unknown origin. They appear both by day and by night, and seem to float through and abov ...

, an unexplained light seen in Norway *

Hodgkin's lymphoma Hodgkin lymphoma (HL) is a type of lymphoma, in which cancer originates from a specific type of white blood cell called lymphocytes, where multinucleated Reed–Sternberg cells (RS cells) are present in the patient's lymph nodes. The condition w ...

, a highly treatable hematological malignancy ("blood cancer") * Hotline, a telecommunications link *

Hydrogen line The hydrogen line, 21 centimeter line, or H I line is the electromagnetic radiation spectral line that is created by a change in the energy state of neutral hydrogen atoms. This electromagnetic radiation has a precise frequency of , w ...

, a spectral line *

Hypotenuse Leg In geometry, two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other. More formally, two sets of points are called congruent if, and only if, one can be t ...

, a postulate of geometry * HL, an amateur radio call sign prefix in South Korea

Other uses

Croatian Labourists – Labour Party The Croatian Labourists – Labour Party ( hr, Hrvatski laburisti - Stranka rada) is a social-democratic and democratic socialist political party in Croatia. It was formed in 2010 by a former trade unionist and People's Party MP Dragutin Lesa ...

(Croatian: '), a political party in Croatia *

Headline The headline or heading is the text indicating the content or nature of the article below it, typically by providing a form of brief summary of its contents. The large type ''front page headline'' did not come into use until the late 19th centur ...

, a text indicating the nature of the article below it *

Heilongjiang Heilongjiang () formerly romanized as Heilungkiang, is a province in northeast China. The standard one-character abbreviation for the province is (). It was formerly romanized as "Heilungkiang". It is the northernmost and easternmost province ...

, a province of China (Guobiao abbreviation HL) *

Hit list (disambiguation) Hit list or The Hit List may refer to: * A list of would-be victims in contract killing * Record chart, a ranking of recorded music according to popularity during a given period of time Film and TV * ''Hit List'' (1989 film), starring Jan-Michae ...

House of Lords The House of Lords, also known as the House of Peers, is the upper house of the Parliament of the United Kingdom. Membership is by appointment, heredity or official function. Like the House of Commons, it meets in the Palace of Westminste ...

, the upper house of the Parliament of the United Kingdom * Higher Level, a level of course difficulty in the

International Baccalaureate Diploma Programme The International Baccalaureate Diploma Programme (IBDP) is a two-year educational programme primarily aimed at 16-to-19-year-olds in 140 countries around the world. The programme provides an internationally accepted qualification for entry into ...

* Hospitality Lawyer, a hospitality resource website founded by Stephen Barth {{disambiguation