Horseshoes are symbols of good luck for a number of reasons, including that they can attach to walls using seven nails, are made by blacksmiths and are believed to ward off evil spirits. Horseshoes are creations of blacksmiths, and blacksmithing was once considered a lucrative and prosperous trade. They also derive the symbolism of good luck from their composition of iron, considered a powerful metal for its ability to withstand heat and flames.
The value of horseshoes varies in societies around the world, although people in many places consider them sacred. Historically, society considered being a blacksmith a lucky trade. Blacksmiths held nearly divine powers as they worked with metal and flames. Instead of suffering burns, they produced valuable consumer products, such as horseshoes. People in turn considered the horseshoes made by blacksmiths equally divine.
Horseshoes derive from iron, which fails to catch fire and melt upon exposure to heat. In ancient times, people considered iron sacred and holy. Hanging a horseshoe in the home warded off evil spirits, provided it hung with the two ends hanging up, forming a u-shape.
Horseshoes take seven nails to attach to walls and frames. The number seven historically holds great importance. There are seven stages in life, seven colors in a rainbow, the moon changes phases every seven days and religions profess the existence of seven deadly sins.