pi-ku
n. A haiku on the theme of the mathematical constant pi. Also: piku. [pi + haiku.]

Example Citations:
Students will spend the morning in 35-minute sessions that include math competitions, integrated math and art workshops featuring origami, pi-ku writing, and a pi(e) eating contest.
—Kari Tutwiler, "Pi and pie to fuel math competition at WSU Tri-Cities," Washington State University News Center, March 11, 2013

Festivities will include pie eating/pi solving contest, pie for sale at the Pie Café, Piku (think Haiku with a twist).
—"Third Annual Jersey City Pi-e Day March 9th," Jersey Bites, March 9, 2013

Earliest Citation:
Fifth-graders in Tiffany Ebright and Stefanie Cook's classes at Fulton Avenue School #8 in Oceanside celebrated Pi Day in honor of Albert Einstein's birthday. Pi is the ratio between the circumference and the diameter of a circle. The children wrote a pi-ku, designed pi posters and competed in a pie-eating contest.
—Mary Ellen Pereira, "Jericho's team bowls them over," Newsday, April 9, 2006

Notes:
Why, look, it's yet another term posted in honor of Pi Day, which is March 14. In case you've forgotten, March 14 can be written as 3/14, and the decimal expansion of pi begins with 3.14, ergo pi lovers celebrate their favorite transcendental number every March 14.

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