The Greek letter phi (φ) is used in geometry as a constant to represent the golden ratio.
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The golden ratio is a number represented by the greek letter ϕ (phi). The value of ϕ is approximately 1.618 and is a naturally occuring number in nature. The golden ratio is often associated with the golden rectangle whose sides form a ratio equal to ϕ.
The golden rectangle is a rectangle whose width divided by height is equal to the golden number (approximately 1.618).
The var phi symbol is a varient of the Greek letter phi.
The capital Greek letter (Φ).