InvestorWords.com
black swan
Definition
Colloquial term for any extremely rare event. The term was popularized by a book by Nassim Nicholas Taleb, entitled "The Black Swan", and was based on a previous belief (now a misconception) that all swans were white and that black swans did not exist. The term is frequently used in the finance and investing sectors to denote an event that is unexpected, and impossible to accurately predict.
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