You should recognise the paper clip icon as a Silk one then ;o)
Not sure what your "but" is? My approach here is that the text name is the name of a famfamfam icon. Although it could be the name of any icon you add to the IconLibrary (that might become clearer tomorrow).
Before I settled on using an "icon library" of embedded images I had used the approach where the value in the column was something like 005 or 113 -- the same as Notes. Then the column renderer pointed the Image to:
It worked but was a bit flickery as the view scrolled. As though each row re-fetched the image from the server each time the row came in to view.
The embedded approach is much more reliable. More tomorrow.