# Pi

### This page is about the meaning, origin and characteristic of the symbol, emblem, seal, sign, logo or flag: **Pi**.

The number pi (symbol: π) /paɪ/ is a mathematical constant that is the ratio of a circle's circumference to its diameter, and is approximately equal to 3.14159.

It has been represented by the Greek letter "π" since the mid-18th century, though it is also sometimes written as pi. π is an irrational number, which means that it cannot be expressed exactly as a ratio of two integers (such as 22/7 or other fractions that are commonly used to approximate π); consequently, its decimal representation never ends and never settles into a permanent repeating pattern. The digits appear to be randomly distributed, although no proof of this has yet been discovered. π is a transcendental number – a number that is not the root of any nonzero polynomial having rational coefficients. The transcendence of π implies that it is impossible to solve the ancient challenge of squaring the circle with a compass and straight-edge.

**Graphical characteristics:**

Asymmetric, Open shape, Monochrome, Contains both straight and curved lines, Has no crossing lines.

**Categories:** Greek Symbols, Mathematical Symbols.

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# Citation

#### Use the citation below to add this symbol to your bibliography:

"Pi." *Symbols.com.* STANDS4 LLC, 2015. Web. 31 Mar. 2015. <http://www.symbols.com/symbol/1317>.