Particle Physics: O(1 TeV) and O(1 pb^-1)

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I saw a sign in particle physics ;O(1 TeV) and O(1 pb^-1). TeV is unit of energy and pb^-1 is unit of cross scetin I wonder why these signs are putting into parahenthesis
 
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ChrisVer said:
This notation means of order of... ...
So O(1TeV) means of order of 1 TeV..

More explicitly, "order of magnitude" (power of ten), i.e. "probably greater than 0.1 TeV and less than 10 TeV"
 
thanks for answers
 

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