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phi

Pronunciation: /faɪ/

The English word “phi” has 3 meanings listed here.

noun

  1. Φ, the 21st letter of the Euclidean and modern Greek alphabet, usually romanized as "ph".
  2. The golden ratio.
  3. A visual illusion whereby a sequential pattern of lights produces a false sense of motion.

Etymology

From Late Latin phi, from Ancient Greek φεῖ (pheî).

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.