What nickname was given to the worldwide stock-market collapse on March 12, 2020?

The worldwide stock-market collapse on March 12, 2020 was widely called Black Thursday.

On March 12, 2020, major stock indexes around the world suffered exceptionally large falls as investors reacted to the rapidly spreading COVID-19 pandemic, travel restrictions, business disruptions, and fears of a deep global recession. The S&P 500 fell 9.51%, its largest one-day percentage decline since Black Monday in 1987 at that point.

The session was part of an unusually volatile sequence in March 2020. U.S. markets also experienced trading halts, known as circuit breakers, on March 9, 12, 16, and 18 after steep declines. Central banks and governments introduced major emergency measures as economic activity contracted.

Black Thursday is sometimes confused with Black Monday, March 16, 2020, when the S&P 500 fell 11.98%. The nickname also differs from the 1987 Black Monday crash and the 1929 Black Tuesday collapse.