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Mathematics 8 Online
OpenStudy (anonymous):

what does this mathematical sign means

OpenStudy (anonymous):

|dw:1336315134628:dw|

OpenStudy (asnaseer):

It is the symbol to represent the set of all integers. this site might be helpful to you for other symbols as well: http://en.wikipedia.org/wiki/List_of_mathematical_symbols

OpenStudy (precal):

|dw:1336316322114:dw| I have also seen it like this

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