Here’s a mnemonic for pi in the form of a poem about Archimedes by A.C. Orr. The number of letters in each word helps you remember pi to 30 spaces.
Now I, even I, would celebrate
In rhymes unapt the great
Immortal Syracusan, rivaled nevermore,
Who in his wond’rous lore,
Passed on before,
Left men his guidance
How to circles mensurate.
And here’s a cute one to remember to 7 places
How I wish I could calculate pi…
Happy Pi Day! (3.14)