What does the corrosive symbol on a product label indicates?

A corrosive symbol on a product label indicates that the product is a corrosive material that could, depending on how corrosive it is, corrode steel or aluminum, or damage skin or other body tissue it may come in contact with. Usually, when we say "contact" we are talking about the skin being in contact with the corrosive liquid. However, vapors from a corrosive liquid can irritate the nose, lungs and eyes. In some cases the vapors of a corrosive liquid can be severely irritating and a hazard in themselves.