What some of the dashboard symbols in your car mean?
All dashboard warning lights and symbols are illustrated and explained in the Owners Manual.
See "Related Questions" below for where to find free online versions of 1996 and up Owners Manuals.
Call your local Ford dealer's service department, and ask a service adviser what this might possibly be. Without other information here on the color of the lamp blinking and what other indicators surround this one, it will be quite difficult to diagnose your problem here.
If you go to ford.com, and flow the links, you can download a copy of your manuals. User Guide, recommended maintenance, etc...