Marking (noun)

1. A visible sign made on a surface.
2. A symbol or design made on an object to indicate its purpose, ownership, or destination.
3. A system of marks or symbols used for recording information or for identification.

Origin:

Middle english (as a noun in the sense "mark, sign"): from old norse mǫrk "boundary, boundary mark," later "mark, sign".

Examples:

1. The police made a marking on the tire to help identify the car.
2. The markings on the packaging indicate that the product is hazardous.
3. The teacher wrote several markings on the student's paper to indicate corrections.
4. The surveyor used a series of markings to identify the boundary of the property.
5. The bird's distinctive markings helped the ornithologist identify it as a new species.