Letter after upsilon

This time we are looking on the crossword puzzle clue for: Letter after upsilon.
it’s A 20 letters crossword definition.
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Possible Answers:

PHI.

Last seen on: –Daily Boston Globe Crossword Answers Monday, March 27, 2023
Thomas Joseph – King Feature Syndicate Crossword – Oct 6 2022
LA Times Crossword 27 Oct 21, Wednesday
USA Today Crossword – May 9 2020
Wall Street Journal Crossword – April 28 2020 – Double Down

Random information on the term “PHI”:

In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. The figure on the right illustrates the geometric relationship. Expressed algebraically, for quantities a and b with a > b > 0,

where the Greek letter phi ( φ {\displaystyle \varphi } or ϕ {\displaystyle \phi } ) represents the golden ratio.[a] It is an irrational number that is a solution to the quadratic equation x 2 − x − 1 = 0 {\displaystyle x^{2}-x-1=0} , with a value of:

The golden ratio is also called the golden mean or golden section (Latin: sectio aurea). Other names include extreme and mean ratio, medial section, divine proportion, divine section (Latin: sectio divina), golden proportion, golden cut, and golden number.

PHI on Wikipedia