Just you think you know most everything about rulers, tape measures, and similar tools, you learn something new. I always thought that, when someone used the term rule instead of ruler, they were just being pretentious. It turns out, as James points out in this Stumpy Nubs video, there is a difference.
A ruler starts with the first mark (e.g. 1″) inset from the edge. Rulers are used in education, working with paper, and other applications where you want confidence in a beginning mark.
A rule has the beginning measurement at a well-ground edge with no initial masurement. A rule is used in woodworking and other situations where you are measuring from inside angles and the like. Cool! I just put a new wrinkle on my brain.
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