Difference between Pi and Phi

Pi

Part of speech: noun

Definition: The name of the sixteenth letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek. An irrational constant representing the ratio of the circumference of a circle to its diameter; approximately 3.1415926535897932384626433832795; usually written π. Metal type that has been spilled, mixed together, or disordered. Also called pie.

Part of speech: verb

Definition: To spill or mix printing type. Also, "to pie".

Part of speech: adjective

Definition: Not part of the usual font character set; especially, non-Roman type or symbols as opposed to standard alphanumeric Roman type.

Part of speech: abbreviation

Definition: pica (conventionally, 12 points = 1 pica, 6 picas = 1 inch) piaster

Phi

Part of speech: noun

Definition: The twenty-first letter of the Classical and Modern Greek, the twenty-second letter of Old and Ancient.A visual illusion caused by lights turning on and off in a sequential pattern that implies motion.The symbol for the golden ratio.