There is no doubt there are many fields where being able to plug something
wrongly is life threatening or way too expensive an outcome. But, there are
many more electrical/electronic systems than different plugs and sockets. It
is simply not realistic to achieve although a connector with several key-way
options can give 2^n different fits. Edge fit PCB connectors used that
method.Witness the number of different mike plug options even for mating plugs.
The two pole version used by Kenwood and Yaesu some 20 years ago were
different polarity. Realistically we are forced back to colour if possible
(PS2 mouse & keyboard) and good labels. As soon as third party kit is
introduced then all bets are off.73 Alan G0HIQ
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