A submarine sandwich, also known as a sub, wedge, hoagie, hero, grinder, or one of the many regional naming variations, is a type of sandwich that consists of a long roll of bread split widthwise into two pieces, and filled with a variety of meats, cheeses, vegetables, seasonings, and sauces. The sandwich has no standardized name, and many U.S. regions have their own names for it; one study found 13 different names for the sandwich in the United States. The usage of the several terms varies regionally, but not in any pattern, as they have been used variously by the people and enterprises who make and sell them. The terms submarine and sub are widespread and not assignable to any certain region, though many of the localized terms are clustered in the northeastern United States.