Bol is a vertical unit of measurement used on Coraab since the beginning of the era of centropolis. A positive bol (so-called +bol) represents height, while a negative záporný bol (so-called -bol) represents depth.
The unit is also often written as BOL.
The horizontal unit is the lant.
Note: The equivalent of 1 bol is cca 5.95 m.