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.



What is the definition of the $\uplus$ symbol?
For the sake of giving a response to tag as an answer:


Some authors use this to denote a disjoint union of sets, i.e., "$A \cup B$ for sets $A, B$ where $A \cap B = \emptyset$."


