Math enthusiasts around the world, from college students to rocket scientists, celebrate Pi Day, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses. Many people will mark the day with a slice of pie — sweet,

Pi Day is Friday, March 14. Restaurants like Blaze Pizza, Sauce, Papa Johns will offer pizza deals, while Village Inn and others will have pie deals.

Royal Perks members can get a free slice of Hershey’s pie on Pi Day when they spend more than $3.14.