The meaning o H

Hi everyone. No code is neccesary.
In the lesson “Adjust the Hue of a Color” FCC says S is saturation, L is lghtness.
That´s ok, I understand.
But: what is the meaning of H in hsl?
Code in some moment shows three numbers in hsl, for example ‘red hsl(0, 100%, 50%)’, the letter S is saturation, the letter l is lightness. What is the letter h. Sorry for any inconvenience


  **Your code so far**

body {
  background-color: #FFFFFF;

.green {
  background-color: #000000;

.cyan {
  background-color: #000000;

.blue {
  background-color: #000000;

div {
  display: inline-block;
  height: 100px;
  width: 100px;

<div class="green"></div>
<div class="cyan"></div>
<div class="blue"></div>
  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36 Edg/89.0.774.75.

Challenge: Adjust the Hue of a Color

Link to the challenge:

the H is for Hue

wikipedia has an article on the HSL way of rapresenting a color if you want

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Hue, this is why the challenge is called “Adjust the hue of a color”.

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HSL = Hue Saturation Lightness

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