the.com/memento
A small object weaponized against forgetting, smuggling the past into your pocket.
means A keepsake or souvenir kept to remind you of a person, place, or moment.
from From Latin memento, the imperative meaning remember — literally a command to your future self, lifted from the phrase memento mori, remember you will die.
Grammar nerdIt is technically a Latin verb, not a noun.
Mori cousinMemento mori means remember death, a medieval mood.
Plural fightMementos and mementoes both pass; pedants disagree loudly.