A ruler, as used to draw straight lines and measure distances. Variously depicted as a metal, wood, or plastic straightedge with length markings at a 45° angle.
Commonly used for content concerning schooling, building, and measurement in various disciplines. May also represent various concepts of straightness and size.
Straight Ruler was approved as part of Unicode 6.0 in 2010 and added to Emoji 1.0 in 2015.
U+1F4CF
? Straight ruler