Letter after pi

This time we are looking on the crossword puzzle clue for: Letter after pi.
it’s A 15 letters crossword definition.
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Possible Answers:

RHO.

Last seen on: –USA Today Crossword – Apr 8 2021
Universal Crossword – Feb 7 2021
The Washington Post Crossword – Mar 30 2020
LA Times Crossword 30 Mar 20, Monday
Wall Street Journal Crossword – March 30 2020 – Abstract Attacks
Universal Crossword – Mar 28 2020
USA Today Crossword – Jan 14 2020
LA Times Crossword 10 Sep 19, Tuesday

Random information on the term “RHO”:

Digamma, waw, or wau (uppercase: Ϝ, lowercase: ϝ, numeral: ϛ) is an archaic letter of the Greek alphabet. It originally stood for the sound /w/ but it has remained in use principally as a Greek numeral for 6. Whereas it was originally called waw or wau, its most common appellation in classical Greek is digamma; as a numeral, it was called episēmon during the Byzantine era and is now known as stigma after the Byzantine ligature combining σ-τ as ϛ.

Digamma or wau was part of the original archaic Greek alphabet as initially adopted from Phoenician. Like its model, Phoenician waw, it represented the voiced labial-velar approximant /w/ and stood in the 6th position in the alphabet between epsilon and zeta. It is the consonantal doublet of the vowel letter upsilon (/u/), which was also derived from waw but was placed near the end of the Greek alphabet. Digamma or wau is in turn the ancestor of the Latin letter F. As an alphabetic letter, it is attested in archaic and dialectal ancient Greek inscriptions until the classical period.

RHO on Wikipedia