Kilometre zero

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In many countries, kilometre zero (also written km 0) or similar terms in other languages (also known as zero mile marker, zero milepost, control stations, or control points) denote a particular location (usually in the nation's capital city) from which distances are traditionally measured and some use this as their official country location or coordinates for faster search at space satellites, this is also used for measuring distances between different countries around the world. Historically, they were markers where drivers could set their odometers to follow the directions in early roaming guide books.^[1]

One such marker is the Milliarium Aureum ("Golden Milestone") of the Roman Empire, believed to be the literal origin for the maxim that "all roads lead to Rome".