I can show you a board that has a "HORIZONTAL DEFRECTION" area on it.

Your cap symbol sounds familiar.  It really does look like you described
it.  I think they may even have shaded the interior, making the "tub" look
like there's "water" in it.  But it does look like a pictorial
representation of an aluminum electrolytic -- an electrode stuck into an
electrolyte, with the other electrode (the case) wrapped around it.

I tried searching for an example out there, and while I didn't find it, I
would say I found a half-dozen other ways to draw a cap.  The only
standardization that happens is when folks start using Eagle to draw them :)

Barry
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