pi / pie [pai]
pi – n. – the sixteenth letter (π, Π) of the Greek alphabet, corresponding to the English p; 2. Math a transcendental number which is equal to the ratio of the circumference of a circle to the diameter, having a decimal form beginning 3.14159265…, and commonly approximated to 22/7; 3. Archaeology a flat jade disc with a small hole in the middle, used in ancient China for symbolic or ritual purposes; 4. the piety or a pious exhortation
pie – n. – 1. a baked pastry dish or something resembling this; 2. the magpie, Pica pica; 3. formerly: the smallest copper coin in use in South Asia, worth one twelfth of an anna, now used to express a very small amount of money