In Thailand, ? – 20th century 1, a unit of length,
originally the distance between the tip of the thumb and the tip of the middle
finger, with the fingers extended as far apart as possible. Since the
standardization of 1923 = 25 centimeters
(about 9.84 inches). Earlier, exactly 10 inches, and before that about 24 cm. 
Also romanized as kup, k'up, keub3, k�b and kug2.
1. United Nations, 1966.
2. Simmonds, page 467.
3. W. A. Browne, page 273.
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Last revised: 18 September 2009.