Weird Hedra shaped unclickable object

Hello all. I have donwnload a free window shutter from the internet and although it's has a good geometry, there is a Hedra alongside of it, which is not clickable and I cannot find what it is to delete it... The shutter was boned but the Hedra remained there even when I deleted the bones. The Hedra is always at the gizmo of the object. If I change the gizmo to somewhere else, the Hedra will follow. It is unclickable but it is selected If I select the object. It has no vertexes or edges etc.

Any idea what it is? See attached image.

Thanks

It looks similar to the main gizmo you get at the pelvis when placing a biped rig. When selected you get to move the entire biped rig, instead of having to select everything before moving the rig. So my guess it is something tied to the animation setup.

It seems you are right but unfortunately I have no idea about animation. Literally zero experience with this. I don't know where to look. I have searched blindly for about 20 mins without any result. Can you indicate me where to look at?

Thank you anyway

The shutter I show on the 1st prnt scrn is actually a mix of two models, however, the Hedra come from this model http://3dsky.org/3dmodels/show/classic_window_1

Dear lord...THANK YOU!

Thank you very much indeed!

...you are killing me here