That is most likely the Check Engine Light. In most usual cases, it's just a faulty sensor you need to replace. Any dealer of your brand of vehicle has code readers for these lights and could tell...
If its just on or flashes all the time then you have a problem with your security system. If it just comes on when you start the car then dont worry about it. Go see a dealer if there is an issue,
i want to know what a certain symbol on the bashboard means.....it show a wrench with the SUV and some wavey lines behing the SUV.....another sign shows up as well...its the SUV within a triangle...