A quadrilateral has four right angles, and every one of its sides measures 8 centimetres. What is the most exact name for this shape?

Explication

Four right angles together with four sides of one length is precisely what the tightest name demands, so nothing weaker describes the shape as fully. The wider name for a four-cornered shape with right angles is true as well, but it stops short of recording that the sides all agree, and the question asks for the most exact name.