Piphilology is the creation and use of mnemonic techniques to memorise Pi's digits.
Poems formed for this purpose are called 'Piems'. Here is an example
Pie
I wish I could determine Pi
Eureka! cried the great inventor.
Christmas pudding, Christmas pie
Is the problem's very centre.
Climb up the short steep slope for a better view, but be warned, the descent is tricky! (We were going to hide the cache up there, but decided to give you the choice instead!)