Hi, I have what I hope is a very simple question related to unfamiliar notation. I am looking through a maths paper on a topic related to set theory which contains a symbol,

$\uplus$,

and I would like to know how, if at all, it differs from the typical

$\cup$

symbol in terms of its meaning.

The context leads me to believe that it does not in fact differ at all but since I don't even know the name of the symbol other than the latex id that I looked up, I can't seem to confirm that suspicion.
Cheers

edit: it seems that the latex renderer also does not know about this obscure symbol '\cupplus' but '\uplus' does work.

edit2: thanks for all the replies! however, since everyone commented rather than providing an answer it seems I cannot grant the coveted 'answer' status to anyone. the disjoint union makes the most sense.

`$A \cap B = \{0\}$`

); both are horrible abuses of notation - mathoverflow.net/questions/18593/… – François G. Dorais♦ Apr 16 '10 at 13:33