aide memoire
/ˌeɪd mɛmˈwɑr/
noun
- Something, such as a note or object, that helps a person remember something.
- He kept a small notebook as an aide-memoire for important dates and tasks.
- The travel guide served as an aide-memoire for all the historical sites we visited.
- She wrote a quick aide-memoire on her hand so she wouldn't forget the grocery list.