φ

See also: Φ [U+03A6 GREEK CAPITAL LETTER PHI], ф [U+0444 CYRILLIC SMALL LETTER EF], Ф [U+0424 CYRILLIC CAPITAL LETTER EF], Փ [U+0553 ARMENIAN CAPITAL LETTER PIWR], and φ.

Translingual

Etymology 1

Named after Ancient Greek Φειδίας (Pheidías) ("Phidias"), who supposedly used the golden ratio in his work, by mathematician Mark Barr.

Symbol

φ

1. (mathematics) The golden ratio, an irrational number with a value of approximately 1.618033988 which expresses the relationship that the sum of two quantities is to the larger quantity as the larger is to the smaller.

Symbol

φ

1. (mathematics) Euler's totient function, an arithmetic function that counts totatives

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Greek

Letter

φ • (f) (lowercase, uppercase Φ)

1. The lower case letter phi (φι), the 21st letter of the modern Greek alphabet.

See also

• (Greek-script letters) Α α, Β β, Γ γ, Δ δ, Ε ε, Ζ ζ, Η η, Θ θ, Ι ι, Κ κ, Λ λ, Μ μ, Ν ν, Ξ ξ, Ο ο, Π π, Ρ ρ, Σ σ ς, Τ τ, Υ υ, Φ φ, Χ χ, Ψ ψ, Ω ω
• (non-Classical letters) Ϝ ϝ, Ͷ ͷ, Ͱ ͱ, Ϻ ϻ, Ϙ ϙ, Ͳ ͳ
• (punctuation) · ;
• (diacritics) ᾿ ῾ ◌́ ◌̀ ῀ ¨

Numeral

φ'

1. The number 500 in Greek numerals.

,φ

1. The number 500,000 in Greek numerals.