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pin
post
piece of metal, usually of cylindrical shape, fixed at the end of the cap so as to engage in the corresponding hole in a lampholder for fixing the cap and/or for making contact
Note 1 to entry: The terms "pin" and "post" generally indicate a difference in size, a pin being smaller than a post.
Note 2 to entry: This entry was numbered 845-08-23 in IEC 60050-845:1987.
Note 3 to entry: This entry was numbered 17-953 and 17-973 in CIE S 017:2011.