Value which is more closer than any other to pi, the relation of the circumference of a circle to its diameter.

1 math.pi

<math.pi />

See also

https://docs.oracle.com/javase/7/docs/api/java/lang/Math.html#PI

Example
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<xsql-script name='PI_sample1'>
    <body>
        <println><math.pi /></println>      -->PI = 3.141592653589793
    </body>
</xsql-script>
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It returns PI (3.141592653589793) with a precision of 16 decimals.