A "black swan" event is a bad financial event no one anticipated. A "white crow" is a good financial event no one anticipated. In statistics, these events are considered a standard deviation greater than 6 sigma.
http://en.wikipedia.org/wiki/Standard_error_%28statistics%29
A black swan is very rare. Most swans are white. Similarly, a black crow is very common. However the white crow is actually albino and comprise 1% of the population.
That's my amateur guess.
I need to give credit where it is due. I read this article from ZeroHedge.com and took my blog title from his reference. Find it here.
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