An arn is a unit of time measurement, used to denote a period of time approximately equal to one Earth hour. It was created by the inability of translator microbes to properly translate units of measurement, and was adopted as an interplanetary unit of measurement throughout the Uncharted Territories, Scarran Empire, and Peacekeeper Space as a result. When those regions were finally contacted by the United Federation of Planets, the arn ultimately adopted by most of the Milky Way.

Source Edit

Arns are used in the series Farscape.