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Looking for the “pie symbol”? This is it — π, the Greek letter pi, best known as the circle constant 3.14159…
Last reviewed on October 1, 2026
The Pi symbol (π) is one of the greek letters characters in the AllSymbols catalog. It is part of the Unicode Greek and Coptic block (U+0370–U+03FF). Greek letters serve double duty: they spell modern Greek and ancient Greek text, and they appear all through math, physics, statistics, and engineering as variable names with conventional meanings.
In technical writing, the letter is the variable; the meaning comes from your field’s convention. Pi (π) is the circle constant in geometry but a probability in statistics. Sigma (σ) is a standard deviation as a variable and a sum operator (Σ) when capitalized. Always introduce a Greek letter on first use unless your audience can be assumed to know the convention.
In Unicode, Pi sits at code point U+03C0. Web pages reference it with the HTML numeric entity π; CSS rules reference it as a quoted hex escape (the four-digit code prefixed with a backslash); in JavaScript and most modern source-code contexts you can either paste the literal character or use a Unicode escape with the same hex digits.
Several Greek capitals look identical to Latin capitals (Alpha = A, Beta = B, Mu = M, Nu = N). They are distinct code points and may render with subtle differences. Use the Latin letter when you mean the Latin letter, and the Greek capital only when the meaning is specifically Greek — this matters for screen readers and search.
If Pi isn’t quite what you need, the Greek Letters page lists every related character on the site — including Alpha and Mu. The related-symbols grid below also surfaces the closest sibling characters.
Searching for the “pie symbol”? The math constant is the Greek letter pi (π). Here are all the characters people usually mean:
| Char | Name | Unicode | Use it for |
|---|---|---|---|
| π | Greek small letter pi | U+03C0 | The circle constant, π ≈ 3.14159. |
| Π | Greek capital pi | U+03A0 | Capital letter in Greek text. |
| ∏ | N-ary product | U+220F | Product notation, like ∑ for sums. |
| ϖ | Pi symbol (variant pi) | U+03D6 | Alternative form used in some physics texts. |
| 𝜋 | Mathematical italic pi | U+1D70B | Styled italic π for math documents. |
| ℼ | Double-struck pi | U+213C | Blackboard-bold pi. |
| 🥧 | Pie emoji | U+1F967 | An actual pie, e.g. for Pi Day posts. |
Pi is approximately 3.14159 26535 89793. Pi Day is celebrated on March 14 (3/14). In Excel and Google Sheets, use =PI() instead of typing the digits; in LaTeX, write \pi.
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The pi symbol is Unicode code point U+03C0. In HTML, use the entity π or the numeric reference π.
It is the pi symbol — π, the sixteenth letter of the Greek alphabet, used for the mathematical constant 3.14159… “Pie symbol” is a common misspelling of the same character.