Phi Symbol
The Greek letter phi (φ) is used in geometry as a constant to represent the golden ratio.
Format  Display  Data 

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Unicode  φ 

Usage
Golden Ratio  Concept
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.
Golden Rectangle  Concept
The golden rectangle is a rectangle whose width divided by height is equal to the golden number (approximately 1.618).
Related Symbols
Var Phi  Symbol
The var phi symbol is a varient of the Greek letter phi.
Capital Phi  Symbol
The capital Greek letter (Φ).