40 pin ceramic dual in line package(dip) or plastic package.

Dual in-line Package Switch. A small collection of switches mounted in a compact package. used for setting codes in garage door openers for example.

DIP = Dual in line-package

PCB = Printed Circuit Board

A dual in-line package (DIP) is a microcircuit package with two rows of seven vertical leads that are easily inserted into an etched circuit board. I hope this answer means more to you than it does to me!

DIP ALSO STANDS FOR DIPLOMA.

A unit with several small rocker-type switches that plugs into a dual in-line package (DIP) on a printed circuit board.