May be the same thing happened to someone at Intel:

CS - code segment
DS - data segment
ES - extension segment
FS - ?
GS - ?

----- Original Message -----
From: "Bob Blick" <bobblick@COVAD.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, September 09, 2003 6:13 PM
Subject: [EE]: Where the double things started - Vcc


> Back before field effect transistors, we had Vcc.
>
> The "cc" stands for "common collector".
>
> Then some idiot who was in a position of power but didn't know what it
> stood for just decided to double up when it was time to start naming other
> supply voltages.
>
> So Vdd should really be Vcd, as in "common drain", but that's even
stupider.
>
> Cheerful regards,
>
> Bob

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