Math Spiral Pi : cool gift idea for all those who love mathematical symbols, Pi Day, geometry, formulas, circumference, infinite series, irrational transcendental numbers, Greek letters, Archimedes, Platonic solids, Fibonacci, Golden Ratio, Sci-fi. Amazing Number Pi - for men, women, children, boys, girls, boyfriend, girlfriend, student, teacher, mathematician, physicist, nerd, geek, birthday, Christmas, special occasions, school, university, college, graduation, tech gadget, scifi, pops,. T-shirt Design: Anne Mathiasz. Thank you for your interest and support of the originals. For more designs please click on the company name. For other topics please enter my name in the search bar.