What is the name of the covering for its opening Snail?

The covering for the opening of a snail's shell is called the "operculum." This hard structure acts as a protective door that can close the opening of the shell when the snail retracts its body, helping to prevent desiccation and protect against predators. Not all snails have an operculum; it is more commonly found in certain types of aquatic and terrestrial snails.