Sharpie (noun)

A type of felt-tip pen with a fine point.

Origin:

From the brand name sharpie, registered trademark of the newell brands company.

Examples:

1. I used a sharpie to write on the poster.
2. The artist uses sharpie markers to create detailed drawings.
3. Sharpies are popular among students for their ability to write on a variety of surfaces.
4. Sharpies are great for writing on dark or colored paper.
5. The permanent ink in a sharpie can make it difficult to remove or erase.