noun
jetsam
JET-sum/ˈdʒetsəm/
Unwanted goods thrown away, especially overboard from a ship.
Pieces of jetsam wash ashore after the crew discards damaged cargo.

Etymology
An “act of throwing” referred here to throwing goods overboard to lighten a ship. The name shifted from the action to the discarded goods, and then more broadly to discarded odds and ends.
In context
hanging on to like some Flotsam and Jetsam and you're just in a stormy sea
More examples
- The sailors spot jetsam floating beside their damaged ship.
- Volunteers clear plastic bottles and other jetsam from the beach.
- The vacant lot is littered with the jetsam of abandoned homes.