Actually, (and I know I spoiled myself sorta, but I couldn't resist), in Jewish angelology -- the only kind I know -- there is a school of thought that says that four angels make up the "Angels of the Face", i.e. those angels are the ones who have seen the TRUE face of G-d, whereas other angels have only seen glimpses or don't get as up close and personal.

If you want more specifics, less IIRC, I have to get some caffeine in me.