The term 'London Taxi' can be summarized as a HACKNEY, which is a seven-letter word. A HACKNEY is a type of horse-drawn carriage that was used in London from the 17th century until the early 20th century. It was used for public transportation and was the first form of public transport in London. The HACKNEY was replaced by motorized taxis in the early 20th century, but the name has remained in use to refer to London's iconic black cabs.