A ruler is called a "ruler" because it has rules. > A ruler, sometimes called a ...

		krispyfi 9 months ago \| parent \| context \| favorite \| on: Minding the gaps: A new way to draw separators in ... A ruler is called a "ruler" because it has rules. > A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. https://en.m.wikipedia.org/wiki/Ruler

A ruler is called a ruler because you use it to MAKE rules. Fixed that for u, wikipedia. :-)