Phi 1.618: The Golden Ratio - Golden Ratio, Phi, 1.618, and Fibonacci in Math, Nature, Art, Design,
Golden Ratio, Phi, 1.618, and Fibonacci in Math, Nature, Art, Design, Beauty and the Face ... Phi for "Neo-Phi-tes:" Phi ( Φ = 1.618033988749895... ), most often pronounced fi like "fly," is simply an irrational number like pi ( p = 3.14159265358979......