phi is incorperated into the golden rectangle, because if you divide the longer side of the golden rectangle by the shorter sid, the answer will be phi.(1.168...)
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ϕ (PHI)
In math, Phi, or the Golden ratio is approximatly 1.6180339887.Otherwise, Phi is how you pronounce a greek letter.
The Golden Rectangle was believed to be founded by Pythagoras. The Golden Rectangle was used for many Greek Buildings such as the Parthenon, and the Villa Stein.
The golden ratio, or golden mean, or phi, is about 1.618033989. The golden ratio is the ratio of two quantities such that the ratio of the sum to the larger is the same as the ratio of the larger to the smaller. If the two quantities are a and b, their ratio is golden if a > b and (a+b)/a = a/b. This ratio is known as phi, with a value of about 1.618033989. Exactly, the ratio is (1 + square root(5))/2.
The golden ratio (or Phi) is a ratio that is very commonly found in nature. For instance, some seashells follow a spiraling path at the golden ratio.