To sign square, outline a square in front of you using both hands, pointing with both index fingers while the rest of the fingers are tucked inside your fists. Starting at the center top, trace the outline of a square on either side with each hand, then have your fingers meet at the bottom center of the square.
We use square when introducing our babies to basic geometrical figures.
We love to teach babies shapes and colors. Try showing your little one square objects like wooden blocks.