memento mori (noun)

1. In the novel, the main character carries a memento mori in the form of a pocket watch to remind himself of his mortality.

2. The Gothic cathedral featured intricate carvings of memento mori symbols, reminding visitors of the transient nature of life.

3. The cartoon character had a memento mori hanging on the wall with a skull symbolizing mortality as a humorous reminder.

4. As a symbol of their love, the couple exchanged memento mori rings inscribed with phrases reminding them to cherish each moment together.