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This form of sigma: ς normally only occurs at the end of a word. If you meet one in the middle of a word, it's almost always a letter called "stigma" and the top bit of it usually extends further to the right. It gets transliterated as st.
This letter is a shorthand way of writing ou. Think of it as υ (upsilon) balanced on top of ο (omicron).
Some other forms of Greek letters are:
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