If you turn on warning messages in Vehicle settings>meter setup. The display will then give you additional wording to describe the functions of the button icon shown on the screen. The icon you mention means that pressing the steering wheel scroll wheel has a current function.
Sometime there will be a small house, this is saying that the HOME button on the steering wheel has a function on the current displayed information.
Example below shows that the HOME button will Dismiss the door open warning, there is also additional text "Door Open" rather than just the image.