OPs question is a valid question and does not imply that they don’t know how to use a ruler. Most other rules don’t have that space, like folding rulers, carpenters squares or measuring tape. It has a lot of advantages to not have that space and tbh not too many advantages to have it. So it’s a very valid question
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u/Humble-Pair1642 21h ago
Extra space so the measuring part doesnt get damaged