Source : Free On-Line Dictionary of Computing

Dual In-Line Package
     
         (DIL, DIP) The most common type of package for
        small and medium scale {integrated circuit}s, with up to about
        48 pins.  The pins hang vertically from the two long edges of
        the rectangular package, spaced at intervals of 0.1 inch.  The
        pins fit through holes in the circuit board to which they are
        soldered or into a socket.
     
        [More than 48 pins?]
     
        (1995-02-06)