Double-deckers, a term commonly used to describe buses and trains with two levels or decks, can also be described using a variety of synonyms. These include bi-level vehicles, dual-level transportation, and high-capacity buses. Another term that is often used as a synonym for double-deckers is the term "articulated buses," which refers to buses that are made up of two or more sections that can be maneuvered around tight corners and narrow streets. Other synonyms include duplex buses, two-story buses, and multi-floor transportation. Ultimately, no matter which synonym is used, the term double-decker is a beloved icon of transportation that has been used all over the world for over a century.