FontsPi Symbol (π)
Tap Copy to get π, or see how to type it on any device below.
- One-tap copy
- Windows, Mac, HTML
- Unicode name
GREEK SMALL LETTER PI
U+03C0 · HTML π · in Unicode since 1.1 (1993)
Pi in other forms
How to type π on any device
| Where | How |
|---|---|
| Windows | Hold Alt and type 227 on the numeric keypad, then release Alt. Or press Windows + . (period), open Symbols and pick it. |
| Mac | Press Fn/Globe + E (or choose Edit > Emoji & Symbols) to open the Character Viewer, then search for pi. |
| HTML | π or π |
| CSS | content: "\3C0"; |
| Unicode | U+03C0 GREEK SMALL LETTER PI |
| LaTeX | \pi |
| Phone or anywhere else | Tap the Copy button above and paste it. |
Lookalikes to avoid
| Character | Unicode name | Code point | What it is for |
|---|---|---|---|
| ∏ | N-ARY PRODUCT | U+220F | N-ARY PRODUCT, the math operator for products (LaTeX \prod). It looks like a capital pi but is a different character. |
| п | CYRILLIC SMALL LETTER PE | U+043F | CYRILLIC SMALL LETTER PE, a Russian letter that looks like a small pi. |
| ϖ | GREEK PI SYMBOL | U+03D6 | GREEK PI SYMBOL, a variant shape of pi (LaTeX \varpi). |
What π stands for
π is the ratio of a circle's circumference to its diameter: 3.14159265358979… It never ends and never repeats.
A short history
The first known use of the Greek letter π for this ratio is by the Welsh mathematician William Jones, in his 1706 book Synopsis Palmariorum Matheseos. Leonhard Euler made it popular in works he published in 1736 and 1748.
Pi Day
Pi Day is celebrated on March 14 (3/14), because 3, 1 and 4 are the first digits of π. Larry Shaw started it in 1988 at the Exploratorium, a science museum in San Francisco, and in 2009 the US House of Representatives supported it.
Frequently asked questions
What is the Alt code for π?
Hold Alt and type 227 on the numeric keypad (code page 437).
How do I type π on a Mac?
Open the Character Viewer with Fn/Globe + E (or Edit > Emoji & Symbols) and search for pi.
How do I write pi in LaTeX?
\pi in math mode; \Pi for the capital.
What's the HTML code for π?
π or π.