It's a big day for mathematicians! 

If you love numbers and pizza (or any other type of pie), there are plenty of deals to find today!

In honor of the famous number of Pi (3.14159265359), pizza places are offering freebies. According to Thrillist.com:

Popular chains -- from Cici's to White Castle -- are even celebrating with special Pi Day deals.

Some places are giving away pizza while most will set a special price of $3.14.

Here are a few national chains deals:

BJ's Restaurant & BrewhouseGet a mini one-topping pizza for $3.14 Thursday. Dine-in only. Learn more at www.bjsrestaurants.com/piday.

Boston MarketWith a Pi Day coupon Thursday, get a free Rotisserie Chicken Pot Pie with the purchase of another pot pie and drink at any one of the more than 450 U.S. locations. The coupon is available at www.bostonmarket.com.

7-Eleven
 Order a whole pizza via 7-Eleven's 7NOW  for just $3.14.

Cici's
The deal: 
Stop in and get an adult buffet for just $3.14 with the purchase of another adult buffet and large drink.