The CR is for Crystal Rectifier
U denotes Unrepairable
K is used to designate Coil(C was already used for Capacitor)
The military standard for Connectors is that the more mobile end of the
connection pair is the Plug and the more fixed end is the Jack regardless of
gender

15 plus years of collecting useless factoids is all it took to know this ;-D
!
Jeffrey A. McGlaughlin
PCB Designer
Battelle Memorial Institute
Columbus Ohio
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        -----Original Message-----
        From:   Jack Olson [SMTP:[log in to unmask]]
        Sent:   Monday, 10 January, 2000 13:22
        To:     [log in to unmask]
        Subject:        [DC] Reference Designators

        Something I overheard this morning got me wondering...

        Have any of you been around long enough to know why a diode would
have a
        designator of CR? What does the CR mean?

        What does the U mean on an Integrated Circuit?

        Is the K on relays arbitrary since R is used by resistors?

        Does anyone really use P anymore for plugs?
        (everything I've seen lately is J on connectors, no matter if it is
a socket
        or a plug)

        What do you use for submodules or subassemblies?

        Not really important, I was just curious....

        Jack