Sometimes the name of successive replacements has no differentiation. For example, the aircraft carrier Enterprise is on it's 3rd iteration as an aircraft carrier and is still just called the Enterprise. There were six previous U.S. navy vessels also named Enterprise. There was no Enterprise II, III, IV, etc. but it is customary to use Roman Numerals for subsequent names when they do occur with ships, such as Queen Elizabeth II, Albatross II, Albatross III, etc.