pic microcontroller discussion list wrote:
>> which are silkscreen labelled CR1, CR2, etc...  What does
>> CR stand for?
>
> CR = "Crystal Rectifier," a term once used for diodes, but
> largely unused since very late in the Jurassic Age.
>
> Why it survives as a component designator abbreviation, I've
> never been able to figure out.  I use "D" for diodes.
>

I've wondered about that too. My theory is that it is meant to
mean "current rectifier"

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