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Black Swan

What is black swan?

· Sarah Mitchell

Key facts

species Cygnus atratus[2]
type swan[1]
plumage black[1]
bill red[3]
native region Australia[3]
term user Nassim Nicholas Taleb[4]

Black swan refers to either a large Australian swan species, *Cygnus atratus*, or a rare, unexpected event with major consequences, commonly used in finance and risk contexts.

Context

The term 'black swan' can refer to a bird or a metaphorical event [3]. In the event sense, it describes rare, hard-to-predict events with major consequences [5]. Taleb's definition includes outlier status, extreme impact, and after-the-fact rationalization [4].

Documented claims

  • In the event sense, a black swan is an unexpected event with significant or severe consequences. [4]
  • Black swan events are difficult to predict and are often rationalized after the fact using hindsight. [5]
  • The term is commonly used in finance and risk contexts. [4]

Questions and answers

What is black swan theory?

Black swan theory refers to the concept of rare, unpredictable events that have extreme impacts and are often rationalized in hindsight [4].

What does black swan mean in finance?

In finance, a black swan is an unexpected event with severe consequences, such as a market crash [4].

Is a black swan a bird?

Yes, a black swan is also a large Australian swan species with black plumage and a red bill [3].

Sources

  1. Black swan event | Definition, History, Examples, & Facts — britannica.com (retrieved August 3, 2026)
  2. BLACK SWAN Definition & Meaning - Dictionary.com — dictionary.com (retrieved August 3, 2026)
  3. black swan — dictionary.cambridge.org (retrieved August 3, 2026)
  4. Tamarind Learning — tamarindlearning.com (retrieved August 3, 2026)
  5. What is a Black Swan? — fs.blog (retrieved August 3, 2026)

Sources last checked August 3, 2026. · More in Things