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Possible Answers: PHI.
Last seen on: Newsday.com Crossword – Oct 20 2018
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.[1] It is an irrational number with a value of:
The golden ratio is also called the golden mean or golden section (Latin: sectio aurea).[3][4][5] Other names include extreme and mean ratio,[6] medial section, divine proportion, divine section (Latin: sectio divina), golden proportion, golden cut,[7] and golden number.[8][9][10]
Mathematicians since Euclid have studied the properties of the golden ratio, including its appearance in the dimensions of a regular pentagon and in a golden rectangle, which may be cut into a square and a smaller rectangle with the same aspect ratio. The golden ratio has also been used to analyze the proportions of natural objects as well as man-made systems such as financial markets, in some cases based on dubious fits to data.[11] The golden ratio appears in some patterns in nature, including the spiral arrangement of leaves and other plant parts.