A poem or short verse written to help the reader remember facts, rules, or a sequence of items. The lines are usually shaped for easy recall, often through rhythm, rhyme, or repetition, so the poem works as a mnemonic rather than as a purely lyrical piece.
Common examples include verses for remembering days in a month, spelling rules, or ordered lists.
Example
Thirty days has September,
April, June, and November;
All the rest have thirty-one,
Excepting February alone.