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I am reading this wiki, but I forget what does the notation O(A1:A2) means.

It has been a while since I read math related stuff :P

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This is not standard notation, so you have to rely on the article itself, which states this is the "relative probability" of $A_1$ and $A_2$ (otherwise known as the "odds"). – whuber Dec 31 '12 at 19:26
@whuber, thank you ;) – davidshen84 Jan 1 at 4:28

closed as too localized by whuber, Hagen von Eitzen, Nameless, Davide Giraudo, Fabian Jan 1 at 18:55

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