A Mayan unit of length, = 20 kalkannes, estimated by Calderon¹ at 8,738 meters. chart symbol "Bak" is Mayan for 400², thus the word derives from 400 kaans.

1. Hector M. Calderon
La Ciencia Matematica de los Mayas.
Mexico, D.F.: Editorial Orion, 1966.

2. Antonio de Ciudad Real.
Calepino Maya de Motul.
Critical edition edited and annotated by René Acuña.
Mexico: Plaza y Valdes Editores, 2001.

Page 73. The Calepino Maya de Motul, a dictionary, was composed in Yucatan in the 16th and 17th centuries.

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