Taxicab geometry or Manhattan geometry is geometry where the familiar Euclidean distance is ignored, and the distance between two points is instead defined to be the sum of the absolute differences of their respective Cartesian coordinates, a distance function (or metric) called the taxicab distance, Manhattan distance ...

The Checker Taxicab, particularly the 1959–82 Checker A series sedans, remain the most famous taxicab vehicles in the United States. The vehicle is comparable to the London Taxi with its iconic, internationally renowned styling, which went largely unchanged from 1959 to keep production costs down.