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How to look up a symbol?

How to get the following relational symbol in the attached image? It's an altered equal-sign and is used by our tutor to denote "the same strings".

enter image description here

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marked as duplicate by Jake, egreg, yo', qubyte, diabonas May 17 '12 at 12:33

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up vote 4 down vote accepted

\bumpeq from the amssymb package.

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What's the qay to negate this? –  myrco May 17 '12 at 9:14
    
@myrco \not\bumpeq –  David Carlisle May 17 '12 at 11:32

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