What is 90 x15?

Assuming that "90 x 15" refers to a mathematical expression or equation, the answer would be 1350.

90 x 15 = 1350

This is a simple multiplication problem where 90 is being multiplied by 15 to get the product or answer of 1350.

Other possible interpretations of "90 x 15" could include measurements such as the dimensions of a room or object, but without more context it is impossible to provide accurate information.