It's an all-out pie palooza because March 14 is National Pi(e) Day!

(CNN) -- It's an all-out pie palooza because March 14 is National Pi(e) Day!

Clever you, you've already figured out that today's date, 3/14, also corresponds to a famous mathematical constant you learned in school: 3.14, also known as pi. So it would stand to reason that today of all days is a great day to celebrate something of a similar name, pie.

In 2009, the U.S. House of Representatives agreed that yes, America, we should have a Pi Day, although it was celebrated beginning in 1988 at the San Francisco Exploratorium. The staff and visitors would march about a circular space and eat fruit pies.

What's the usual way of celebrating Pi Day? Why indulging in your favorite pie and talking about the relevance of pi, of course! Pie eating contests are also welcome, or you can even make a pie with the pi symbol on it like our iReporters.If this is all a little too geeky for comfort, why not make a double apple pie (with a cornmeal crust) just because it's Pi(e) Day! You've never had a better excuse.

We reached out to our ever-innovative team of iReporters to see what they were baking up in celebration.

Key lime pie (and 200 digits of pi)

Lulis Leal of New York City says her favorite pie is, "the amazing world-famous key lime pie from Blue Heaven in Key West, Florida."

She says, "Their key lime pies are the perfect combination of creamy, tangy and sweet - piled ridiculously high with a wonderful, light and airy meringue on a perfect graham cracker crust. My husband and I love it so much that we had it as our wedding "cake" when we had our wedding celebration in Key West, and we always enjoy going back to Blue Heaven for more!"

She also filmed herself reciting the first 200 digits of pi from memory. She says math was always a favorite subject of hers and thinks people should celebrate Pi Day. "I think it's a fun day that encourages kids to get more involved in mathematics and have fun with it."

Peanut butter chocolate mousse pie

Cat Troiano, a freelance writer and avid cook in Yaphank, New York, shared a peanut butter chocolate mousse pie with salted peanuts, dark chocolate and coarsely chopped peanut butter cups, a recipe she developed last summer based on "one of the most sublime pies" she and her husband ever had, at a resort in Saint Thomas.

She says she had never heard of Pi Day before she stumbled across this assignment. "Since I have had a lifelong sweet tooth, I will have no problem at all with commemorating the occasion by baking at least one pie and savoring every last bite."

Apple and pear pie

Zeynep Rice celebrated Pi Day early with this apple and pear pie she baked on March 11. The main filling of this pie is derived from a deep dish apple pie recipe, and she made it her own by adding pears. Besides loving pies, her family also loves math, Rice says; her husband is a math teacher.

She added flair to her pie by not only denoting the numerical symbol and 3.14, but also placing red circles on the edge that "represent the never ending digits of pi in an infinite loop," she says.

Buttermilk pie

Janie Lambert says her brother started making this pie recipe a few years back and every time the family sampled the buttermilk recipe there was always a fight for the last piece. Although not typically a pi day celebrator, Lambert says she plans on celebrating the March math holiday by serving this dish to her family.

Purple yam pie

Roberto Victoriano, a Filipino design engineer in Auckland, New Zealand, explained how to make a purple yam pie. '

"Buy whole purple yam root crops or ready grated pouches (available at Asian stores). Steam them. Mash. Mix with 1 kilo of brown sugar, condensed and evaporated canned milk. Put in large cauldron. Keep stirring in low heat. This is a labor of love for the next 1.5 to 2 hours, so keep stirring because if you don't, it will burn. Never mind an aching arm afterwards - worth it for the taste. When [it's] really thick and you can't stir anymore, that's when it's ready," he said.

PI-neapple rhubarb pie

Michele Hays lives in Evanston, Illinois, and blogs about food at Quips, Travails, and Braised Oxtails. She creates pi inspired pies every year. "I'm not particularly good at math. However, I do love to cook, and I'm learning that cooking is really a system of applied mathematics."

She told CNN, "I think pi is important and I love any excuse to make and eat pie. Why not have a special day for both? You know, places like Europe and South America don't have pi day because they write the month second - heartbreaking!"

Tomato cheese pies

Natalie Montanaro, a Peace Corps volunteer in Campia Turzii, Romania, says she has tasted numerous tomato pies in Charleston, South Carolina, and added her own touches when she crafted this simple pie designed for kids and picnics. She plans on baking more pies to celebrate this year's Pi Day.

As a math lover she says she appreciates the mechanics behind pi, and considers it to have many real world applications, "Especially when it comes to cooking or balancing my budget."

Lemon custard

iReporter Chris Morrow of San Diego, California, says she made this lemon custard pie in 2009 for an annual Pi Day party, involving "six geeks reciting pi to as many decimal points as possible." She says she has made apple, sweet potato, cherry, chocolate and cream pies in the past, but she hasn't decided what to make this year.

Pop-tart pie pops

Kelly Buhler, an American accountant and food blogger at An American Cupcake in London, says she was inspired to make these delightful mini cherry pie pops for Pi Day when she heard about CNN iReport's Pi day pie-off.

"I've had pie pops on my 'to bake' list for two years! This finally got me to actually doing it since it was for such a fun holiday. I'm glad I did. They were fun to make and taste delicious too!"