Flatiron or flat iron can mean several things:

• An old term for a clothes iron (see ironing), now largely out of date
• A wedge-shaped building:
  • The Flatiron Building in New York City, for which the surrounding Flatiron District is named
  • Flatiron Building (disambiguation), numerous other wedge-shaped buildings
• The Flatirons, rock formations near Boulder, Colorado
• Flat Iron, Indiana, a small community in Vermillion County
• Flat iron steak, a cut of beef

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