A thing used to erase or remove something written or drawn by a pen or a pencil.
A thing used to erase something written by chalk on a chalkboard, by marker on a whiteboard, or by some other erasable implement; a chalkboard eraser, whiteboard eraser, etc.
One who erases.
An overwriter program used to prevent data recovery.
An instrument used to remove ink from a writing surface, either (traditionally) a metal scraper or (more recently) a special pen dispensing a chemical that eradicates ink.