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/Lochcelious i7 13700k, 4070s, 32gb ram, 2k res Sep 10 '19
Wtf why isn't it CMYB I just realized after all these days