What does it mean when a signal like an exclamation mark is flashing?

The exclamation mark (British English and Commonwealth English) or exclamation point (American English) is a punctuation mark usually used after an interjection or exclamation to indicate strong feelings or high volume (shouting), and often marks the end of a sentence. Example: "Watch out!" Similarly, a bare exclamation mark (with nothing before or after) is often used in warning signs.

That is the check transaxle light. if it starts to flash it means you have a transmission problem

Tire pressure

The yellow exclamation mark appears when your TPMS, AKA tire pressure monitoring system picks up on a low-pressure tire. It means that your tires aren't inflated to the recommended pressure. A simple fix is to inflate to the required PSI, and if the problem does not go away, drive down to the nearest garage, as you may have punctured tire at your hands.

It means something needs service. You have to pull the codes to know what...

The flash yellow exclamation mark (!) is a transaxle warning, it means you need to it service as soon as possible.

i think that is your traction control light

In most common cases, it's a handbrake signal, so make sure your handbrake or parking brake isn't slightly on, even if you can't hear it those sensors are on a hairline trigger. if that's not it look in your owner's manual.

Good possibility you need a new timing belt