Memento

According to the American Heritage Dictionary a memento is, "a reminder of the pas; a keepsake." It originally comes from the Latin word memento, an imperative of the word meminisse, meaning to remember. It traveled from Latin to Middle English where memento was a "commemoration of the living or the dad in the Canon of the Mass. 

I like the way this word sounds. If you say it fast enough it sounds like a different word or phrase entirely. I come up with "momma's toe" when I say it fast enough.