# π
> The mathematical constant [π][pi].
## Usage
```javascript
var PI = require( '@stdlib/constants/float64/pi' );
```
#### PI
The mathematical constant [π][pi].
```javascript
var bool = ( PI === 3.141592653589793 );
// returns true
```
## Examples
```javascript
var PI = require( '@stdlib/constants/float64/pi' );
console.log( PI );
// => 3.141592653589793
```
[pi]: https://en.wikipedia.org/wiki/Pi