A History of Short Words

From the New York Times Crossword Puzzle

KARAT

Sun, 27 Oct '24
Jeweler's unit
Sun, 20 Aug '23
Assayer's unit
Sat, 11 Feb '23
K, for Kay
Tue, 26 Jul '22
Gold standard
Mon, 9 May '22
Measure of gold's purity, not its weight