Why is $s$ used for arc length? I looked around online, but I can't find a definite answer.
Thank you!
2026-04-05 14:32:04.1775399524
Why is $s$ used for arc length?
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I strongly agree with Karl's and Björn's comments regarding the Latin orgin: spatium.
See: Leonhard Euler, Mechanica sive motus scientia analytice exposita, Tomus I, Petropoli, 1736 :