In 1911, there was a factory that made shirtwaists in New York
City. A shirtwaist was a kind of woman's blouse. The name of the
company was the Triangle Shirtwaist Company, so their factory was
called the Triangle Shirtwaist factory.
In March 1911, there was a disastrous fire in the factory and
146 employees, most young women, died in the fire or jumped to
their deaths to avoid the fire.
That factory fire came to be called the Triangle Shirtwaist Fire
or the Triangle Shirtwaist Factory Fire.