(CNN/WJLA) -- Today isn't just any old Friday -- it's also Pi Day.
March 14, or 3-14, is a date celebrated each year by math enthusiasts and number fans across the world.
It's based on the first three numbers of pi, or 3.14, which represents the ratio of a circle's circumference to its diameter.
While 3.14 are pi's first three digits, the number goes on and on, forever, as far as we know.
Computers have calculated pi to its two-quadrillionth digit -- but when it comes to this number, truly, the pi's the limit.
Today might be a good day for D.C. Metro area folks to visit their favorite bakery, as many "pie" bakers are likely to be offering some special treats in honor of the occasion.
Do you know of a great deal in the area in honor of Pi Day? Tell us about it! Tweet it to us at @ABC7News.