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Greek Letters
φ

Greek Small Letter Phi

U+03C6

The Greek small letter phi represents the twenty-first letter of the Greek alphabet. In science and mathematics, it is famously used to denote the golden ratio, an aesthetic proportion found in nature and art.

Copy & encode

Character
φ
Unicode codepoint
U+03C6
HTML named entity
φ
HTML decimal entity
φ
HTML hex entity
φ
CSS escape
\03C6
JavaScript escape
\u03C6

Meaning and usage

Beyond geometry, this symbol is utilized in physics to represent magnetic flux, in biochemistry to indicate dihedral angles, and in philosophy to represent values or concepts. It is also common in academic writing.

Frequently Asked Questions

Is there a difference between the curly phi and the straight phi?
Yes, the curly phi is the standard lowercase form, while the straight or open phi is a variant glyph often used specifically in mathematics to avoid confusion with other variables.
How do I type phi on a standard English keyboard?
You can copy and paste it from a character map, or switch your keyboard input method to Greek and press the F key.