Super-basic: Outliner versus 3d View armature representation?

In the outliner, there’s a line for Armature with a green ‘man’ icon, underneath which is all the bones.

  1. What function does that line in the outliner serve? In at least two places in the UI when you select it it lists the current item as “Bone” rather than just “Armature” (Properties header and Stats display.)

  2. Is there a representation/icon inside the 3dView for the Armature item?