In Archicad’s parameter list, every parameter seems to have a "U" shown in front of it (for example, before AC_show2DHotspotsIn3D).What does this "U" stand for, and what is its function?Thanks in advance for your help! 

As an architect working extensively with structural and architectural coordination in Archicad, I would like to propose an enhancement to the Model View Options (MVO):  Feature Request: Add an option to "Hide Beams Below Slabs" in floor plan view ✦ ...