Meaning of the word phi in English

What does phi mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

phi

US /faɪ/
UK /faɪ/

Noun

the 21st letter of the Greek alphabet (Φ, φ)

Example:
In mathematics, the symbol phi (Φ) is often used to represent the golden ratio.
The Greek letter phi is pronounced like 'fai'.
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