Letter between pi and sigma

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Possible Answers:

RHO.

Last seen on: LA Times Crossword 22 Nov 21, Monday

Random information on the term “RHO”:

Greek orthography has used a variety of diacritics starting in the Hellenistic period. The more complex polytonic orthography (Greek: πολυτονικό σύστημα γραφής, romanized: polytonikó sýstīma grafīs), which includes five diacritics, notates Ancient Greek phonology. The simpler monotonic orthography (μονοτονικό σύστημα γραφής, monotonikó sýstīma grafīs), introduced in 1982, corresponds to Modern Greek phonology, and requires only two diacritics.

Polytonic orthography (from polýs (πολύς) “much, many” and tónos (τόνος) “accent”) is the standard system for Ancient Greek and Medieval Greek. The acute accent (´), the circumflex (˜), and the grave accent (`) indicate different kinds of pitch accent. The rough breathing (῾) indicates the presence of the /h/ sound before a letter, while the smooth breathing (᾿) indicates the absence of /h/.

Since in Modern Greek the pitch accent has been replaced by a dynamic accent (stress), and /h/ was lost, most polytonic diacritics have no phonetic significance, and merely reveal the underlying Ancient Greek etymology.

RHO on Wikipedia