Koh-i-Noor, a 105 carat (21.6 g) diamond, once the largest known diamond in the world
KKOH, News Talk 780 KOH (in Reno, Nevada) is the promotional reference for KKOH, even after FCC deemed all radio stations must have 4 letters in their legal identification call signs.
See also
Kou (which might be confused due to similar pronunciation)
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