Memento (noun)

1. A reminder or keepsake of a past event or person.
2. An object kept as a reminder of a person or event.

Origin:

Early 17th century: from latin, literally "remember!", from memento, imperative of meminisse "remember". the original sense was "a reminder or keepsake", later "a token or souvenir".

Examples:

1. I have a few mementos from my trip to Paris, including a small painting.
2. The locket was a memento of her mother who had passed away.
3. He kept the ticket stub as a memento of his first concert.
4. The photo album was filled with mementos of her childhood.
5. The old watch was a memento of his grandfather who had passed away.