1. Check engine
What it looks like: You're screwed.
What it means: There's a sensor somewhere that's reading something out of range. It's probably nothing, but worth having someone that knows what they're doing take a look.
2. Low fuel warning
What it looks like: An anthropomorphic 1950s-era gas pump, scratching its head in confusion, often with an arrow.
What it means: You should fill up sometime in the near future, within the next 50 miles or so. Or, if you're a rocket scientist, just stop in the middle of the road, immediately. Either way, the arrow points to the side of the car with the gas cap.
3. Water temperature warning
What it looks like: An upper case E, hung at half mast on a flag pole in the middle of the ocean.
What it means: Your car's coolant is getting pretty hot. Get yourself to the side of the road -- or better yet, to a parking lot -- as quickly as possible, or you risk overheating your engine.
4. Low oil pressure warning
What it looks like: Your afternoon tea is ready.
What it means: Your oil pressure is too low. The biggest takeaway is to get off the road, because there's not enough oil lubricating your pistons, and your engine doesn't like chafing any more than you do.
5. Battery charge warning
What it looks like: LEGO blocks for math teachers.
What it means: There's not enough juice getting to your battery. The cause can be anything from a dying alternator to simply having too many electrical gizmos running at once. Turn off as many electrical things as you can, like your lights if it's not dark, your radio, unplug your phone, etc. Do NOT turn your car off until you get somewhere safe, in case it doesn't start again.
6. Parking brake indicator
What it looks like: Your phone's not compatible with the latest Apple emoji updates.
What it means: If this light is on, the good news is you're one of the few who actually uses your parking brake. The bad news is your parking brake is still set.