RULE

one of a set of explicit or understood regulations or principles governing conduct or procedure within a particular area of activity

control of or dominion over an area or people

the normal or customary state of things

a strip of wood or other rigid material used for measuring length or marking straight lines; a ruler.

exercise ultimate power or authority over (an area and its people)

pronounce authoritatively and legally to be the case

make parallel lines across (paper)

(of a price or a traded commodity with regard to its price) have a specified general level or strength