Low gear.
The gearbox won't change up to a higher gear than that selected. Won't help you in snow, more of use for descending a hill with engine braking.
Some auto cars have a snow setting - this will start off in 2nd or 3rd to minimise wheelspin.
Many modern autos don't have the traditional PRND321 or PRNDL as they have a tiptronic function.
SSE