**Golden Mean Golden Ratio **

The number , or about 1.61803. The Golden Mean arises in many settings, particularly in connection with the Fibonacci sequence. Note: The reciprocal of the Golden Mean is about 0.61803, so the Golden Mean equals its reciprocal plus one. It is also a root of *x*^{2}* – x – *1* = *0.

Note: The Greek letter phi, φ, is often used as a symbol for the Golden Mean. Occasionally the Greek letter tau, τ, is used as well.

**See also**

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