HSL

A colour model that represents colours using three components: Hue (the type of colour, such as red, green, or blue, expressed as a degree on a colour wheel from 0 to 360), Saturation (the purity or intensity of the colour, from grey to fully vivid), and Luminosity or Lightness (how light or dark the colour appears, from black to white). HSL is commonly used in accessibility contexts for colour sonification and contrast analysis because its components map intuitively to perceptual qualities of colour that can be independently encoded into non-visual modalities like sound.