Mathematics - Square (Quadratus) <math>a^2</math>
<math>b^2</math> is usually read as b squared.
See Mathematics - Exponentiation (square, cube) - Power
Squared is usually used in formula to get rid of the sign. To go back on the same scale, the root squared operator is used.
Quadratus is Latin for square.
The inverse function of square is the square root.