Personalized Happy Pi Day Math Symbol Pirate Women's V-Neck T-Shirt. Funny happy Pirate Day Pi symbol math Women's V-Neck T-Shirt - Heather has cute green pi wearing an eye patch for students or teachers. 5.0 oz., 100% pre-shrunk cotton Athletic Heather is 90/10 cotton/polyester 1x1 rib collar with mitered v-neck Shoulder-to-shoulder taping Ladies' fit