Baktun
According to a line from the script of the  first season episode , a baktun was a unit of time used by the then-extinct Tkon Empire.

The Ages of Tkon, which marked eras in their history, were divided into baktun. According to the Portal, there were seven baktun of time separating the Age of Makto from the Age of Fendor. 

The Mayan calendar had a unit of the same name, .

fr:Baktun
Unused production material