adjective
marked
MARKT/mɑːrkt/
Distinguished by a conspicuous identifying sign.
The marked crate stands between two plain crates.

Etymology
Marked first meant having a mark, then developed the sense of being clearly defined or easy to distinguish. A marked difference therefore stands out as though visibly singled out.
More examples
- Please put donations in the marked boxes by the door.
- Visitors must park in the marked spaces.
- A marked police car waits outside the station.
Forms
marked
mark noun — A visible sign used to identify something.