K (Kilobyte)
1024 bytes, a binary 1,000 Abbreviation for black in four-colour process printing in CMYK
Kerning
Adjustment of spacing between certain letter pairs
Keyline
An outline drawn on artwork showing position of an illustration
Kill fee
Payment due to a writer if they do not get the right to adapt their work as a script
Knock out
Mask out an image
Kraft paper
A tough brown paper used for wrapping and packing