O OneWordDaily
AI-generated image
Word of the Day Wednesday, June 10, 2026

phi

/faɪ/ symbol · British & US
Valid in UKValid in US
Share WhatsApp

What does phi mean?

symbol

The 21st letter of the Greek alphabet, used in mathematics and science to represent the golden ratio, a mathematical constant approximately equal to 1.618.

Example

"The phi ratio is often seen in the arrangement of leaves on stems and branches of plants."

Definition generated by AI and curated by RJS Tech Solutions LLP.

Synonyms for phi

Rhymes with phi

Etymologically related