a plane figure with four equal straight sides and four right angles.
He arranges thin rectangles, squares , triangles and trapezoids in complex patterns on the wall.
the product of a number multiplied by itself.
a circle's area is proportional to the square of its radius
an L-shaped or T-shaped instrument used for obtaining or testing right angles.
a carpenter's square
a person considered to be old-fashioned or boringly conventional in attitude or behavior.
He's a plodding, conventional square , she's a get-ahead, modern girl who doesn't need to cling to conventional wisdom.