I am looking for information on a weird music notation symbol.  It is
described to me as an "x" with four dots in between it's lines.  The x
had a step, upwards, and was found in oboe music.

I searched the net and only found information on a forign language
symbol, not quite what I was looking for.

I am looking for just basic information on the note.  If you happen to
find a history of the symbol, it would be awesome, but not required. 
Please append to your solutation any resulting search strings as I'm
curious to how you find it :).

Thanks,
Matt

A double sharp, or the "segno" for a da capo notation?

See: http://www.dolmetsch.com/musicalsymbols.htm

My search was just for "musical symbols", followe by a quick scan of
what was offered.

Yes, I think it is the sign for "dal segno", as Xarqi found.  At the
end of the piece, at the double bar, there should be "DS" or "DS al
fine", indicating that the music continues from the the sign.  This is
Italian notation for a "repeat".

A double sharp preceeds a note, and a da capo is not actually in the staff.

This was actually the note head, like a quarter note or whole note. 
It had a solid stem as well.

How about this:
http://www.coloradocollege.edu/dept/mu/Musicpress/notes+stems.html

It does not have the dots, but the stem (can't have everything :)

I found that site through this one, which has lots of info about
notation, but this is the nearest I found to what you seem to be
describing.

http://www.music-notation.info/en/compmus/musicnotation.html

Is the score printed or a manuscript?  Does the "note" have a value
(1/4, 1/8 note) in the measure?  (Not that I could do anything with
the info.)

One of the links in the last site may have a contact address.

I hope someone can tell us.