To some people, Pi Day is about mathematics. To others, it’s an excuse to eat pizza. Either way, there will be celebrations on Friday, March 14. Pi is the ratio of a circle’s circumference to its diameter, named after a Greek letter. It’s a constant number with an infinite number of digits, as explained by the U.S. Census Bureau.

To give the menu item a celebrity twist, Pizza Hut enlisted Robert Gronkowski, former award-winning football tight end and pizza lover. Gronk designed his own board loaded with all his favorites and even filmed a YouTube video of his fixings.