What is the meaning of φ?

Euler's totient function, an arithmetic function that counts totatives

Alternative form of ϕ, the golden ratio.

a voiceless labiodental fricative (IPA [ɸ]).

a voiceless labiodental fricative (IPA [ɸ]).

Lower-case phi (φεῖ), the 21st letter of the ancient Greek alphabet. It represented the voiceless aspirated bilabial plosive /pʰ/ and later the voiceless labiodental fricative /f/. It is preceded by υ and followed by χ.

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

Source: wiktionary.org

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