The term "Oyster card" is widely known as a prepaid travel card used in London to facilitate public transportation. However, there are several other synonyms to this card such as Transport for London (TfL) Travelcard, Contactless card, Travel smart card, Fare card, Metro card, Smart card, Tap and Go card, and Electronic ticketing system. All these synonyms are used interchangeably in different parts of the world to describe a card that enables commuters to access public transportation with ease. Whether you prefer to call it an oyster, travel card, or smart card, it remains an essential tool that helps thousands of people move from one place to another on a daily basis.