The little "i" on the instrument panel of a 2010 Dodge Ram typically indicates an
information message. It means there's a notification or alert stored in the vehicle's computer system that you should check. This could range from something minor like a low tire pressure warning (that might also illuminate a specific tire pressure light) to something more serious, such as a malfunctioning system.
To see the specific message, you'll need to consult your owner's manual for the exact procedure. Usually, it involves pressing a button (often located on the steering wheel) or cycling through various display options on the instrument cluster.