Check your owner's manual for the most accurate information for your vehicle for any switches or warning lights. That symbol usually refers to the traction control system. If it is on a button, pressing it will turn off the system and possibly illuminate a similar looking warning light on the instrument panel. The system should turn its self on again every time you start your car. The TC system is a good safety system that tries to prevent spin-outs and other kinds of loss of control in emergency handling situations. I can't think of any good reason to ever turn it off for a typical driver unless it is malfunctioning and causing a problem. If you are stuck dead in the snow, it is sometimes helpful to be able to spin your tires somewhat to work your way out. In that case, you will need to turn TC off momentarily to do that. Once you get going, turn it back on. Some speed freaks turn it off so they can drive like Vin Diesel.

Read the manual. It might just mean outside temperatures near freezing.

It is a traction control light and if it is on it means your traction control has been turned off (or is faulty). The traction control should be on permanently and the only time you see that sign is when the car does it's self checks when you start it or if turned off.

Read your manual.

icy road conditions ,