1) Fast take-off 2) Hazardous substance list 
Hue, Saturation, and Lightness. A method of describing any colour as a triplet of real values. The hue represents the colour or wavelength of the colour. It is sometimes called tone and is what most people think of as colour. The hue is taken from the standard colour wheel and is thus calibrated in degrees about the wheel. Saturation is...
[Naval Acronyms and Slang] High Speed Launch (RAF)
Hue, Saturation, and Lightness. A method of describing any colour as a triplet of real values. The hue represents the colour or wavelength of the colour. It is sometimes called tone and is what most people think of as colour. The hue is taken from the standard colour wheel and is thus calibrated in degrees about the wheel. Saturation is the depth o...
acronym: Hazardous Substance List (EPA)
Hypertonic saline
(Hue-Saturation-Lightness) A color space used to represent images based on polar coordinates. Intensity is the vertical axis of the polar system, hue is the relative angle, and saturation is the planar distance from the axis. HSL is thought to be more intuitive to manipulate than RGB space.