What was the nickname of the 1929 U.S. market crash's most famous session on October 24?

The most famous opening session of the 1929 U.S. market crash on October 24 was called Black Thursday.

On that day, panic selling surged on the New York Stock Exchange. Major bankers attempted to restore confidence by buying heavily traded stocks, and the market temporarily stabilized. The intervention did not end the broader collapse, however.

Further major selling occurred on Black Monday, October 28, and Black Tuesday, October 29. The crash helped mark the beginning of the Great Depression, although historians generally treat the depression as the result of several interacting economic and financial forces rather than one trading day alone.

Black Thursday is therefore distinct from the October 29 session often called Black Tuesday. The supplied question about the Dow’s lowest closing value during 1929–1932 concerns a later measure of the wider bear market, not this opening crash day.