Integral notation with short horizontal line

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jostpuur
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What does it mean when an integral sign has a short horizontal line drawn on it?
 
Is the mean, i.e.

[tex]\frac{1}{|\Omega|}\int_\Omega[/tex]

where [itex]|\Omega|[/itex] is the measure of [itex]\Omega[/itex].
 
Ok. Anyone knowing how to type it with latex? I didn't see it in lshort.pdf (The not so short introduction to LaTex)