1. 

   DevonMatthews Member

   Its in 2001 September exam solution to Q8, i have never seen this symbol before.

    

   DevonMatthews, Aug 4, 2009

   #1
2. 

   didster Member

   It's one of the many symbols used to represent "approximately equal to".

    

   didster, Aug 4, 2009

   #2

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