The letter between sigma and upsilon in the Greek alphabet is TAU. It is the 19th letter of the Greek alphabet and is pronounced as "tah". It is a consonant and is used to represent the sound /t/.
Here are some other possible answers to the crossword clue "Letter between sigma and upsilon":
Chi
Xi
Omicron
Pi
Phi
I hope this helps! Let me know if you have any other questions.
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