The odometer is one of the oldest parts of a car dashboard. However, progress does not stand still and in addition to easily recognizable numbers, today you can see various letters on it. Some of them look very mysterious and without a clue (or reading a car manual) it will be quite difficult to guess what they all mean and why they are needed in practice. Take at least the letters "A" and "B" that appear.
Few people know, but the odometer appeared long before the first car was created in the world. The device for the account of wheel revolutions appeared even before our era. Moreover, it was invented (as is often the case) was in several places at once. It is known that one of the first odometers for calculating the revolutions that a cart wheel made was created by the famous mathematician Archimedes in about 287-212 BC. There was also a track meter in China, where it appeared around the 2nd century AD. The creation of the device is attributed to the Chinese philosopher Zhang Heng.
Of course, modern odometers differ significantly from their ancient predecessors. Moreover, they are different from those that people had to see at the dawn of the automotive industry. Even if the general principle of operation of the device does not change, modern technologies are doing their job, adding very unexpected functions even to such a simple thing.
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On modern electronic panels, next to the odometer, you can see many strange and, at first acquaintance, incomprehensible values. For example, there the letters "A", "B", "C", "T", numbers "1" and "2", combinations of letters and numbers "T1" and "T2" can flaunt on the screen. All of these designations are typically used on modern dashboards to refer to the same things - different mileage of a car. So, in addition to the total mileage, the car odometer can show daily mileage, fixed mileage from point "A" to point "B", or mileage since the last engine start. Depending on the specific model and manufacturer of the car, different symbols can be used to denote all this data.
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Why is all this needed? To improve the convenience of using the car. In this simple way, you can measure the distance from the starting point to the destination. This functionality is mainly useful for manual calculation of fuel consumption. If some strange signs appear on your odometer, you can find out about them from the car manual.
If you want to know even more interesting things, then you should read about why not pour tap water into the car washer tank.
A source: https://novate.ru/blogs/230620/55023/