What does the K stand for within CMYK?

What does the K stand for within CMYK?

K = push button (black)



The black is referred to as K for key – a shorthand for the printing permanent status key plate. This plate impressed the artistic detail of an figurine, usually in black ink.
"BLACK" I am a pictographic designer
Cyan Magenta Yellow And BLACK.

The 4 colors used n process printing.
key for black
I chew over it's a new Calvin Klein fragrance.
Black, the is to avoid any cyan (blue) related confusion.
black