What is the letter for the reverse gear in an automatic transmission?

[Timothy]

The letter for the reverse gear in an automatic transmission is R, which stands for Reverse, meaning to move backward. An automatic transmission generally refers to a car's automatic gear-shifting mechanism, where the control system of the automatic transmission selects the appropriate gear based on the engine's speed and load during driving, replacing the driver's subjective judgment and gear-shifting operation. Typically, an automatic transmission car has six gear positions, from top to bottom: P, R, N, D, S, L. The engine's power is transmitted through the gearbox, which is also a key factor affecting fuel consumption. Generally, an automatic transmission consumes more fuel than a manual transmission. Regardless of whether it's a manual or automatic transmission, the more gears there are, the more fuel-efficient it tends to be.