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I am familiar with the direct sum of sets, $\oplus$.

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closed as off-topic by Jonas Meyer, Vladimir Reshetnikov, Mike Pierce, k1.M, 91500 May 30 '15 at 5:24

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4  
In what context? In some contexts, it means tensor product. – lhf Apr 7 '11 at 11:59
3  
More generally, this list can be useful: en.wikipedia.org/wiki/List_of_mathematical_symbols – joriki Apr 7 '11 at 12:15
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The direct sum of sets?!? – Rasmus Apr 7 '11 at 14:49
1  
The $\otimes$ symbol usually means 'some multiplicative binary operation', which may differ depending on context. – AJMansfield Dec 1 '13 at 19:42
up vote 12 down vote accepted

The $\otimes$ symbol is used for the tensor product.

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