Code word for the letter K (4)

I believe the answer is:

kilo

(Other definitions for kilo that I've seen before include "Metric prefix meaning 1,000" , "more than two pounds" , "Unit of mass" , "possible drugs unit" , "Prefix for thousand" .)

I've seen this clue in The Mirror.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.