affordance

noun3

1. •
   Anything that is provided or furnished by an environment to an organism dwelling within it.

   • So an affordance cannot be measured as we measure in physics. — 1979
2. •
   A potential transaction or operation that is made possible by a given object or environment; especially, one that is made easily discoverable.
3. •
   Any interactive control or component serving as a cue to the user to take some action.

   • The grab handles on the edges of this image are affordances that the user can exploit to change the size of the image.