A design classic is an industrially manufactured object with timeless aesthetic value. It serves as a standard of its kind and remains up to date regardless of the year of its design. Whether a particular object is a "design "classic might often be debatable and the term is sometimes abused but there exists a body of acknowledged classics of "product designs from the 19th and 20th century.   For an object to become a design classic requires time, and whatever lasting impact the design has had on society, together with its influence on later designs, play large roles in determining whether something becomes a design classic. Thus, design classics are often strikingly simple, going to the essence, and are described with words like iconic, neat, valuable or having meaning. for example a vacuum cleaner is often known as a hoover, which was not the vacuum cleaner's name but instead was the surname of its inventor, William Henry Hoover.