memento (noun)

1. In the science fiction novel, the protagonist finds a memento from a forgotten civilization that triggers memories of past events.

2. The memento from the old Victorian house was a decorative glass window that served as a reminder of the building's rich history.

3. The ancient relic was believed to be a memento left by the gods, symbolizing the power and glory of past events in mythology.

4. The superhero's lair was adorned with mementos collected from his previous adventures, each one representing a significant event in his crime-fighting career.