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The edge of the blade should be called as edge of the blade. But in practice the cutting edge is probably called as margin of the blade. The expert in English language should explain better.
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).
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.
Generally a ruler is a straight edge, but it can be anything... I generally just use a spare pencil.
head, blade, working edge