Personalized Pi Day Math Symbol Celebration Party Women's V-Neck T-Shirt. Celebrate Pi Day with a Women's V-Neck T-Shirt - Pink featuring distressed look math symbol logo for students, engineers or a math teacher. 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