The horseshoe has meant good luck since the Romans. Its three components--iron, horses, and its crescent shape--are its three facets. Hanging a horseshoe over the doorway with the curve down is supposed to bring good luck.
“Symbol Origins: The Lucky Horseshoe.”
Symbol Origins: The Lucky Horseshoe. [Video Segment]. Available from https://www.discoveryeducation.com
Chicago Manual of Style
Symbol Origins: The Lucky Horseshoe. Video Segment.
https://www.discoveryeducation.com (accessed ).