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I've googled, but still couldn't understand what is/who are "3 monkeys".

Here is a link -- http://en.wikipedia.org/wiki/Three_wise_monkeys

But in general, the three monkeys are sitting next to each other -- one with his hand on his mouth, one with his hand on his eyes, and one with his hand on his ears -- saying we hear nothing, we see nothing, and we speak nothing...