markers

1. An object used to mark a location.
2. Someone or something that marks.
3. A real or virtual objective, something to be aimed for.
4. A felt-tipped pen.

   Susie used a marker to write her name on the wall.

5. Marks of ink left by this type of pen.

   Susie has gotten marker all over the walls, and it looks dreadful.

6. A signed note of a debt to be paid.
7. A nonmonetary debt owed to someone, especially in return for a favor.

   We may not be able to do this alone. Maybe it’s time to call in some of our markers.

8. A device that fires a paintball.
9. A defending player who stays close to an opponent in order to mark them.
10. A player employed by a private club and available to compete against members.
11. A gene or DNA sequence with a known location on a chromosome that can be used to identify individuals or species.
12. A recognition given by a competition authority that a company is the first to approach it to reveal the existence of a cartel, as a prelude to a formal application for leniency for the company.

verb

To mark or write on (something) using a marker