A ruler is a device used to measure distances or draw straight lines. Look up ruler in Wiktionary, the free dictionary. Ruler may also refer to: A person who wields significant or total political power Ruler (film), a 2019 Indian Telugu-language action film Ruler (gamer), stage name of League of Legends player Park Jae-hyuk Ruler (horse), a racehorse Golomb ruler, comprises a series of marks such that no two pairs of marks are the same distance apart Slide rule, a mechanical analog computer "Ruler", a song by Marnie Stern from This Is It and I Am It and You Are It and So Is That and He Is It and She Is It and It Is It and That Is That Rule (disambiguation) This disambiguation page lists articles associated with the title Ruler.If an internal link led you here, you may wish to change the link to point directly to the intended article.