Personalized Happy Pi Day Math Symbol Pirate Men's V-Neck T-Shirt. Funny happy Pirate Day Pi symbol math Men's V-Neck T-Shirt - White has cute green pi wearing an eye patch for students or teachers. 4.7 oz., 100% pre-shrunk cotton Narrow, set-in 1x1 mitered V-neck collar Shoulder-to-shoulder taping Double-needle stitched sleeves and bottom hem