[texhax] a question for logicians

Alexandre Almeida a.c.alexandre at live.com
Fri May 2 16:41:20 CEST 2008

There is a symbol that I don't know how to write it in Tex/laTex .I saw lots os documents, websites, and none of them show this symbol.
It is a triangle made of 3 points, instead of lines. In a logic expression, it is used to give us the result. 
For exemplo if \exists ... therefore ...
How can I write this symbol? 
Thank you,Alexandre.              
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