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The Greek letter sigma (σ) has a different form (ς) when used at the end of a word. This distinction seems unnecessary to me, and it's not clear why it would emerge. Do we know why and when this distinction came to be? Was there a benefit for making this distinction? Does the evolution of the character or the literature explain how we ended up having two forms? This distinction seems to only appear in lowercase text, but I am not sufficiently familiar with the evolution of the Greek alphabet.

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    In Arabic most letters have four different forms depending on position (initial, medial, final, isolated.) I have no sources, but this seems natural to me, and more natural the more handwritten the alphabet is. In handwriting you naturally tend to make letters slightly different if they are at the beginning or end of a word (or following an "o", for example.) Although in Greek letters are separate from each other, letters are sinuous, (especially sigma) and I see no reason not to suffer such changes along centuries – Rafael Mar 22 '18 at 12:07
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Thompson 1912 mentions the following on page 189:

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Not a full answer but at least something to start with.

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    (+1) Excellent quote concerning the tendency to write final sigma differently. For those who haven't seen the text which Thompson is talking about, I thought it good to point out that the uncial sigma doesn't much resemble the modern forms. The word ισως looks like ιcωc, the sigmas appearing as C, both in the middle and at the end. The main difference is that the final C appears top-heavy; i.e. the upper part of the C extends downward. Looking at Thompson's texts, I would say that the modern forms don't start to appear until around the 14th or 15th centuries. (see e.g. pg. 264) – Expedito Bipes Mar 23 '18 at 13:31
  • @PédeLeão BTW, C-like sigma is called "lunate sigma", and is ancient – Rafael Mar 23 '18 at 16:38

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