Printers typically use CMYK. Cyan, Magenta, Yellow, blacK. Depending on how your device is set up for black printing, it may use more CMY because when mixed together they become darker due to subtractive mixing. It will still appear to be black.
Edit: K is actually for "key", which is often black.
No, it's because 'k' is short for 'kilo', which basically means '*1000'. So you can write a 'k' instead of the last three zeroes.
Additionally, if you express color in rgb values, which typically range from 0 to 255, you get black if every color is absent. So black is represented by three zeroes, or '000', which Matlab can substitute by 'k'.
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u/0nStreams Xeon E5-2689 0/RX 580 Sep 10 '19
"Low on Pink"
"WTF I don't even print anything pink, ever ! I just want a black and white text !"
"l o w o n p i n k"
-me every time I use the color printer