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Perhaps, that's a very easy question - I wonder what's the code of the symbol that looks like the square bracket [ but whose vertical line is double, like in || represented by $\|$.

SBF
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    Have a look at these answers http://tex.stackexchange.com/questions/14/how-to-look-up-a-symbol-or-identify-a-math-alphabet – Ludovic C. Oct 21 '13 at 12:48
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    Questions like this tend to be closed as a duplicate of the question that Ludovic linked to above. In this specific case, you might find the answer faster by looking at http://tex.stackexchange.com/q/81785/86 (which was itself closed as a duplicate of the above question). – Andrew Stacey Oct 21 '13 at 12:52
  • @AndrewStacey: thanks, I've spent a couple of minutes trying to draw this symbol in detexify, but I was not successful – SBF Oct 21 '13 at 13:18

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