Phi (Letter)

• The golden ratio 1.618... in mathematics, art, and architecture.
• Euler's totient function in number theory.
• The argument of a complex number in mathematics.
• The value of a plane angle in physics and mathematics.
• The work function in electronics.
• The phase of a wave in signal processing.
• In spherical coordinates phi is usually used to represent the angle to the z axis.
• In engineering, the diameter symbol is often referred to as "phi". This symbol is used to indicate the diameter of a circular section, for example means the diameter of the circle is 14 inches or millimeters, depending on the context.
• Any function in mathematics.

• The magnetic flux in physics.

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