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How to look up a symbol?

How does one make the symbol for a blackboard bold kind square brackets ,something like [[.The symbol being talked about is used for containing formulas whose truth values are being talked about in propositional logic. Thanks and regards An image of the symbol: enter image description here

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the symbol i am talking about is something like [[ squeezed together to form one symbol used in propositional logic. e.g \tau [[phi]]=1 –  heboy Nov 7 '12 at 10:21
    
Finding an image on Google Images might help users determine the exact symbol you're referring to. –  dunc Nov 7 '12 at 10:37
    
i have edited the question and added an image of the symbol. –  heboy Nov 7 '12 at 10:47
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migrated from stackoverflow.com Nov 7 '12 at 13:18

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marked as duplicate by lockstep, Andrew Stacey, egreg, percusse, Claudio Fiandrino Nov 7 '12 at 13:49

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1 Answer

up vote 12 down vote accepted

You are looking for

  • \llbracket and \rrbracket from the stmaryrd package
  • \textlbrackdbl and \textrbrackdbl from the textcomp package

Detexify is an online tool that can help you find latex symbols by drawing them.

detexify-example

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If I could've upvoted more than once, I would've. –  Vatine Nov 7 '12 at 10:51
    
thanks a lot.that was really helpful. –  heboy Nov 7 '12 at 10:58
    
Detexify is great. It worked fine even with my limited drawing skills. –  lhf Nov 7 '12 at 11:38
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