InspirationzStore Typography - Pi symbol math sign. Mathematical black and white mathematics number - BLACK Full Length Apron with Pockets 22w x 30l (apr_164891_4) Dimensions (in inches): 22 W x 30 L; image size 7.5 x 7.5 65/35 Polyester/Cotton Blend Two waist-level patch pockets Adjustable neck strap Ties around the waist