What does HSL stand for?

Hue, Saturation, and Luminescence (less common; probably incorrect)

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High School Liaison (various locations) High Speed Launch (British powerboat; UK) High Speed Link Hindustan Shipyard Ltd (India) Hindustan Steel Limited (India) Hoge Snelheids Lijn (Dutch train) Holland Sociaal Liggend (Dutch: Holland Social Landscape; cycling club) Home School Link Home Station Launch Hormone-Sensitive Lipase		Hue, Saturation, Lightness Humane Society of Lewisville, TX Huntington Station Library (Huntington Station, NY) Hybrid Solar Lighting Hydrographic-Survey Launch Hypermedia Synchronization Language (Digital Research Corporation) Hypertonic Saline Health and Safety Lawyers Association (UK) High School Leadership Academy (Bridgewater College; Virginia) High Speed Label Applicator