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


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

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