I am familiar with the direct sum of sets, $\oplus$.
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5In what context? In some contexts, it means tensor product. – lhf Apr 07 '11 at 11:59
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3More generally, this list can be useful: http://en.wikipedia.org/wiki/List_of_mathematical_symbols – joriki Apr 07 '11 at 12:15
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10The direct sum of sets?!? – Rasmus Apr 07 '11 at 14:49
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4The $\otimes$ symbol usually means 'some multiplicative binary operation', which may differ depending on context. – AJMansfield Dec 01 '13 at 19:42
