π².
var PI_SQUARED = require( '@stdlib/math/constants/float64-pi-squared' );
Square of the mathematical constant π.
var bool = ( PI_SQUARED === 9.869604401089358 );
// returns true
var PI_SQUARED = require( '@stdlib/math/constants/float64-pi-squared' );
console.log( PI_SQUARED );
// => 9.869604401089358