The exclamation light, on your Ford focus, is a reference to the oil needs to be changed. The light can be reset by changing the oil.
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Check your brake fluid.
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That's your LOW tire pressure warning light in a 2002 Ford Windstar
On a 2008 Ford Mustang : That is the ( LOW TIRE PRESSURE ) warning light * located below your tachometer
that light is the light to say that you have a brake problem, normally low brake fluid hope this helps
On a 2004 Ford Explorer : The ( LOW tire pressure warning light ) is below and to the left of the tachometer
If the symbol resembles a a U with an exclamation point and there are square ridges on the bottom of the U that means you have Low Tire Pressure. If the symbol is a complete circle and resembles a sun with an exclamation point in the center it means it is a exterior light that has burned out. All these warning lights & symbols are illustrated and explained in the Owners Manual. See "Related Question" for a handy pdf version of any Owners Manual from 1996 on.