During the First World War, the British Army launched a secret project to build the first ground motor vehicles. But it wasn't easy to store the large pieces of iron that they were carrying from one side to the other, so they said they were plates to make fuel tanks or tanks, to keep the real goal secret. This armoured vehicle was given the proper name of Mark I (in the photo) and was the first used on the battlefield. However, the generic name of the artifact was invented unintentionally before, when they tried to hide the project. From then on they were told it was a tank or a tank.