Notation question: like a direct product

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SUMMARY

The notation in question is identified as a semidirect product, represented by the symbol "X" with a vertical line connecting the two left side ends. This notation is commonly used in mathematical contexts, particularly in group theory and quantum field theory. The specific example provided is from the text "Quantum Field Theory for Tourists" by Folland, where the semidirect product is denoted as G = R^4 \ltimes SL(2,C). The discussion highlights the importance of recognizing such notations for accurate interpretation in advanced mathematics.

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I am coming across a notation in a math text whose form and context suggest it is something like a direct product. The symbol is a multiplication X with a vertical line connecting the two left side ends. Can someone identify this symbol please?

The context can be seen here http://books.google.com/books?id=3J...CQrZcB&sa=X&oi=book_result&ct=result&resnum=1 2/3rds the way down on the page. This is an online preview of the text I am reading.
 
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Hurkyl to the rescue again. That is it.

And look. The article lists the LaTex commands. <br /> G = R^4 \ltimes SL(2,C)<br />
 
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