Firstly, it is the colour, defined in RGB format (which is a triplet of 3 numbers between 0 and 255 - black is
rgb(0, 0, 0)), using base-16 (rather than base-10 (decimal)) for the numbers. “Black” doesn’t mean anything specific. The RGB value is the intensity of each of the colour channels used by eg your computer screen or by your TV. It’s easy for a computer to read (and it is always exactly the same size), and it’s easy for a human to pass around to other humans, regardless of language.
// split into 3 pairs
// Convert to decimal (exactly the same in this case)
And also, what do you call the other thousands of colours that don’t have names?
Also what about: