Dear Nipper,In the uk we refer to a combination or cluster of indicator lights wether they are for the reversing of or to blind some idiot who needs specticals who is sitting on your tail trying to read the 3.l outback logo as reversing /fog. that means one light is above the other but not neccessarily in that order. They are in an assembly as one but operating individualy but also in tandem with their opposite numbers,e.g.,nearside and offside(not to be confused with english football offside)!!