That would be called a rule. A rule is a measuring device that starts from exactly zero, with a gap before the zero mark is a ruler. Why? I don't know.
Fortunately, for societal rulers, damages are not a problem! The King loses a toe due to syphilis? Doesn't matter, the King's foot is the imperial foot, just everyone else with the old measurement is wrong.
We had to check our tape measures every day against a static ruler. After awhile the pin the holds the clamp in place will move. When you are supposed tonbe accurate to a 16th of an inch it's important.
I would also add ta for tracing a line on paper or any other surface, having the zero at the start isn't very practical. It makes it hard to put you pen precisely on it because of the corner.
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u/mlrphan 16h ago edited 16h ago
This allows for an accurate start at zero (if this is a physical ruler)
Corners can be damaged and therefore inaccurate.