Similarly, though in general rav'eq "ceiling" refers to the ceiling of a room that has a room above it, it may also be used for the ceiling of a room on the top floor, even though there is no corresponding rav and no tlhoy' SaS. On occasion, though, the ceiling of the top floor is called pa' beb, literally "room's roof" (from pa' "room" plus beb "roof"). The term beb refers to the covering on top of a structure.

(Usenet message of December 07, 1998)