triple witching hour
the last hour of trading on the New York Stock Exchange on the four Fridays each year when stock options, stock index futures, and options on such futures simultaneously expire: regarded as a time of extreme volatility in trading.
Why Did “Noon” Used To Mean 3:00?Surprisingly, the term noon wasn’t always shorthand for midday at 12:00; in fact, it used to refer to a different time of day altogether.
Origin of triple witching hour
First recorded in 1985–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019