Greek Symbols

Pi Symbol

Π π

The pi symbol (Π / π) is a letter of the Greek alphabet. This page covers its meaning across mathematics, science, and engineering, its Unicode code point, TeX command, and Windows Alt codes — and you can copy and paste the pi symbol with one click.

Uppercase Pi Symbol (Π)

Π
SymbolFormatData
ΠUnicodeU+03A0
ΠHTMLΠ
ΠCSS\03a0
ΠJavaScript\u03A0
Π\PiTeX\Pi
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Greek Capital Letter Pi (Π)ImageDownload ↓

Also known as: pi, uppercase pi, big pi, greek pi, product symbol, product notation, product sign, pie.

The Greek capital letter Pi (Π) is the standard symbol for a product of a sequence of factors, written with index limits like the summation sign. It appears throughout analysis, combinatorics, and number theory, for instance in product formulas for factorials and in infinite product expansions. In chemistry Π denotes osmotic pressure, and in geometry it may label a plane.

n!=∏k=1nkn! = \prod_{k=1}^{n} k

Lowercase Pi Symbol (π)

π
SymbolFormatData
πUnicodeU+03C0
πHTMLπ
πCSS\03c0
πJavaScript\u03C0
π\piTeX\pi
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Greek Small Letter Pi (π)ImageDownload ↓

Also known as: greek pi, pi letter, 3.14159, circle constant, pi constant, circumference ratio, pie symbol, pi sign, euler pi.

The Greek letter pi (π) denotes the ratio of a circle's circumference to its diameter, an irrational constant approximately equal to 3.14159. It appears throughout geometry, trigonometry, and analysis, including in the period of trigonometric functions and in Euler's identity. The same letter in other contexts can label a projection map or a prime-counting function.

A=πr2A = \pi r^2

Pi Symbol Alt Codes

On Windows, hold Alt and type the code on the numeric keypad, then release Alt. Num Lock must be on.

Alt CodeCaseSymbol
Alt227Lowercaseπ

Codes without a leading zero are legacy OEM codes; they depend on a US English Windows code page.

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Pick a letterform, adjust its size, colors, and spacing, then copy the ready-to-use HTML code or download it as a square image.

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π
Pi Symbol — Π Greek Capital Letter Pi, π Greek Small Letter Pi