Greek Small Letter Phi Symbol

A symbol from the Math Symbols collection. Click the symbol or the button below to copy.

Symbol: φ
Unicode: U+03C6
HTML entity: φ
Category: Math Symbols

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89 of 96 in the math symbols collection

About the greek small letter phi symbol

Phi is the twenty-first letter of the Greek alphabet. In its lowercase form it appears as an oval with a vertical line through it, though handwritten and typographic variants sometimes use a closed circle with a stroke. The uppercase form is a large circle crossed by a vertical or horizontal line.

In modern Greek, phi represents the voiceless labiodental fricative sound /f/. Its primary use beyond alphabetic writing is as a mathematical and scientific symbol, where it denotes the golden ratio and the Euler totient function, among other quantities. It also appears in physics for magnetic flux and in engineering for the diameter of circles.

How to type Greek Small Letter Phi

Native keyboard shortcuts for each operating system — derived from the codepoint, so the steps below are always accurate.

Windows

2 options

In Word / Outlook: type 03C6 then press Alt + X.
Anywhere: press Win + . to open the emoji & symbol picker, then search.

macOS

2 options

Enable “Unicode Hex Input” in System Settings → Keyboard, then hold Option and type 03C6.
Or: Control + Command + Space opens the Character Viewer — search by name.