The golden ratio is equivalent to 1.618… is denoted by a symbol Φ. What is the origin of this symbol?
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The Cyrillic letter Ef (Ф, ф) descends from phi. As with other Greek letters, lowercase phi is used as a mathematical or scientific symbol. Some uses, such as the golden ratio, require the old-fashioned 'closed' glyph, which is separately encoded as the Unicode character U+03D5 ϕ GREEK PHI SYMBOL.
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