Sub-Group: Transparencies
A sub-group of various transparency settings ranging from 0 to 100% in increments of 5%. This is to aid in the design and modeling processes when looking thru a part may be helpful. This approach of dragging the desired transparency is sometimes more productivity then using the "Set as Transparent" tool.
You simply drag the desired transparency on to a part/assembly in your scene and only the transparency will change while maintaining the color the part.
The postfix indicates the percentage of transparency set.