a tattoo that has something to do with straight-edge, a subculture and lifestyle choice about not drinking, doing drugs or having casual sex. a straight-edge tattoo could be lyrics from an edge band or x's.
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A ruler has markings, a straight edge does not. In "straight edge and compass" constructions, you are not allowed to mark the straight edge. Things that are impossible using only a straight edge and compass are possible if markings are allowed (for example, it's possible to trisect an angle using a marked straight edge).
Generally a ruler is a straight edge, but it can be anything... I generally just use a spare pencil.
A straight line from the center of a circle to the outer edge is called a radius.
A straight edge
A vertical edge is A line that go straight up and down