What do you mean by P, R, N and D?

R is reverse gear, D is forward gear, N is neutral gear, and P is parking gear.

1, p gear: indicates parking gear. When engaged in this gear, the parking lock mechanism locks the transmission output shaft. 2.r gear: it means reverse gear. When this gear is engaged, the reverse oil circuit of the hydraulic system will be connected, so that the driving wheel will reverse and drive in the opposite direction. When the vehicle is not completely stopped, it is not allowed to forcibly turn to the "R" gear, otherwise the transmission will be damaged. 3. N gear: it means neutral gear. When engaged in neutral, the planetary gear system idles and cannot output power. 4.d gear: it means forward gear. When the shift control handle is in this gear position, the hydraulic system control device will automatically connect the corresponding forward gear oil circuit according to the throttle opening signal and the vehicle speed signal, and can automatically shift gears up and down with the change of driving speed, thus realizing the automatic speed change function.

Gear shifting, also known as gear shifting, is an abacus term, which refers to the gear of a given calculation unit, and now refers to the order of gear shifting.