Pi vs. Phi: What's the Difference?

Pi and Phi Definitions
Pi
(also pē) The 16th letter of the Greek alphabet. See Table at alphabet.
Phi
The 21st letter of the Greek alphabet. See Table at alphabet.
Pi
(Mathematics) A transcendental number, approximately 3.14159, represented by the symbol π, that expresses the ratio of the circumference to the diameter of a circle and appears as a constant in many mathematical expressions.
Phi
Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
Pi
An amount of type that has been jumbled or thrown together at random.
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Phi
(mathematics) The golden ratio.
Pi
To jumble or mix up (type).
Phi
A visual illusion whereby a sequential pattern of lights produces a false sense of motion.
Pi
To become jumbled.
Phi
The 21st letter of the Greek alphabet
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Pi
The 16th letter of the Classical and Modern Greek alphabets and the seventeenth in Old Greek.
Pi
(mathematics) An irrational and transcendental constant representing the ratio of the circumference of a Euclidean circle to its diameter; approximately 3.14159265358979323846264338327950; usually written π.
Pi
(metal typesetting) Metal type that has been spilled, mixed together, or disordered.
Pi
(typography) pica (conventionally, 12 points = 1 pica, 6 picas ≈ 1 inch).
Pi
Piaster.
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Pi
(metal typesetting) To spill or mix printing type.
Pi
(typography) Not part of the usual font character set; especially, non-Roman type or symbols as opposed to standard alphanumeric Roman type.
In computing, pi characters may be entered with special key combinations.
Pi
Pious.
Pi
A mass of type confusedly mixed or unsorted.
Pi
A Greek letter (
Pi
The letter
Pi
To put into a mixed and disordered condition, as type; to mix and disarrange the type of; as, to pi a form.
Pi
The ratio of the circumference to the diameter of a circle
Pi
Someone who can be employed as a detective to collect information
Pi
The scientist in charge of an experiment or research project
Pi
The 16th letter of the Greek alphabet
Pi
An antiviral drug used against HIV; interrupts HIV replication by binding and blocking HIV protease; often used in combination with other drugs