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phi

 (n): the 21st letter of the Greek alphabet
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noun
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10 months ago arby said:

Also an acronym for Protected Health Information, mandated by HIPAA legislation.

about 1 year ago seanahan said:

The actual "Golden Ratio" is (1+sqrt(5)) / 2, which is 1.618...

about 1 year ago oroboros said:

Greek letter symbol for the irrational number known also as the "golden ratio": 1.618033989...

It is derived by calculating:(sqrt 5) plus-or-minus 1, all divided by 2.

The golden ratio can be characterized as, a:b::b:(a+b), or, using actual figures:

.618... :1 :: 1 : 1.618...

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