BMW M4 Wheel buttons?

What do all this buttons stand for?
Here is a list of most of the buttons which are included. Please help me to get all that shortcuts of the buttons.
RAD - ?
TC - Traction Control
OK - ?
FCY - ?
DRK - ?
Hi - ?
ALS - ?
WIP - Wiper
PSL - ?
N - ?
STG - ?
LNC - ?
HYB - ?
DIS - ?
A/D - ?
P - ?
LIM - Limiter
ENG - Engine ?
PGE - ?
STA - ?
Comments
RAD - Radio
TC - Traction Control
OK - Confirm
FCY - Full Course Yellow
DRK - Drink
Hi - High Beam
ALS - Anti-Lag System
WIP - Wiper
PSL - Pit Speed Limiter
N - Neutral
STG - Not used in BMW M4, its a Cap of the BMR. Dont know the meaning on the BMR.
LNC - Not used in BMW M4, its a Cap of the BMR, but meaning is Leaf Nitrogen Concentration.
HYB - Not used in BMW M4, its a Cap of the BMR, but meaning is Hybrid.
DIS - Not used in BMW M4, its a Cap of the BMR, but meaning is Display.
A/D - Not used in BMW M4, its a Cap of the BMR, but meaning should be Automatic Drive.
P - Not used in BMW M4, its a Cap of the BMR, but meaning is Pit.
LIM - Not used in BMW M4, its a Cap of the BMR, but meaning is Limiter.
ENG - Not used in BMW M4, its a Cap of the BMR, but meaning is Engine.
PGE - Not used in BMW M4, its a Cap of the BMR, but meaning is Page.
STA - Not used in BMW M4, its a Cap of the BMR. Dont know the meaning on the BMR.
Thanks!
Missing Buttons for Ignition, Starter, Light
Full Course Yellow - why need a driver to press Button for Full Course Yellow?
To limit the speed to 80kph.