What is s for length derived from?

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The letter "s" used to indicate length may derive from the German word "Strecke," meaning "distance" or "line segment." Some discussions suggest it could also originate from the Latin word "spatium," which translates to "path." There is uncertainty about whether "s" is an arbitrary label or has a specific etymological source. The connection to both German and Latin highlights the linguistic roots of the term. Understanding the origin of "s" can enhance clarity in discussions about measurements.
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What is "s" for length derived from?

Hello.
I would like to ask what word is the letter "s" indicating length derived from? I can't seem to find it anywhere and I don't know if it is purely arbitrary label, or if it's from some actual word. Thank you very much.
 
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It might be from German "Streche, Strechung" or something like that.
 


"Strecke"="distance" or "line segment".

The german Wikipedia indicates that the latin "spatium" (~"Path") might be the origin.
 
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