I have a 07 sonata a yellow horse shoe symbol with an exclamations point appeared what doe it mean?

an explanation point with a horse shoe looking symbol under it is your low tire pressure indicator one or more of your tires is low on air ===known as a tpi indicator = tire pressure indicator

The little horse shoe-looking looking thing is actually supposed to be a cross-section of a tire. That would be your Tire Pressure Monitoring System (TPMS) trying to tell you to check the pressure in your tires because it has determined that one or more of them are low.

This is covered in the Owner's Manual.
If you don't have an Owner's Manual for your Hyundai, you can get one HERE

Low tire pressure

A yellow explanation point symbol on the dashboard typically applies to the Tire Pressure Monitoring system. A thick ! inside a half drawn flat tire symbol to be complete and comes in yellow color when lit. Under normal vehicle set-up, if this indicator stays lit after the power-on selftest, you need to check your tires for any uneven pressures and adjust their pressures to correct specifications. Okay? : )

A red exclamation point inside a circle when lit indicates your parking brake is on, or your brake fluid level is low.

That sounds like your tire pressure monitoring system. It's just indicating that you have one of your tires low on air and your going to need to add some. 32 psi i believe.

Replace the horse shoes LOL

A yellow explanation point symbol on the dashboard typically applies to the Tire Pressure Monitoring system. A thick ! inside a half drawn flat tire symbol to be complete and comes in yellow color when lit. Under normal vehicle set-up, if this indicator stays lit after the power-on selftest, you need to check your tires for any uneven pressures and adjust their pressures to correct specifications. Okay? : )

You mean horse-shoe? Low tire pressure.

This is the tire pressure indicator. It may occasionally flash you are while driving. Check the overhead led console to see if any of your tires are currently low on air.

That is usually a tire pressure sensor warning light telling you that your tire pressure is at an unsafe level or that a sensor is bad. Think of that symbol as a cutaway of a tire.

As for the owner manual, you can get a copy by registering at the Toyota Owner's Site. It is free.

http://www.toyotaownersonline.com/Owners/reg.do