Dashboard warning light meaning on 2006 GMC Yukon Denali

A dashboard warning light that resembles a truck & padlock just came on. We are not certain what this means since our truck did not come with the owner's manual. Anyone have any insight?

Get Your Car Fixed at a RepairPal Certified Shop.
We certify shops based on expertise, quality work, and verified customer reviews
1 answer
The light indicates reflects the anti theft system related to having the proper key.