Learner's definition of BADGE
a small object (such as a tag, pin, or metal shield) that is worn or held up by a person so that it can be easily seen, that has writing (such as a person's name) and often a picture on it, and that shows who the person is
The policeman flashed his badge.
Don't forget to wear your name badge.
The receptionist glanced at my visitor's badge.
a cloth patch that can be sewn onto clothing and that is awarded to a person (such as a Boy Scout or Girl Scout) for doing something
something that represents or is a sign of something else