A rubber or plastic inflatable cushion.
A shock absorber that uses an air chamber.
A layer of trapped air that supports a hovercraft.
Soft filling material used in cushions etc.
Extra characters such as spaces added to a record to fill it out to a fixed length.
Extraneous text added to a message for the purpose of concealing its beginning, ending, or length.
Anything of little value used to fill up space.