The Celtic Shield Knot is usually displayed as a square-like symbol that is within a circle. It symbolizes protection from danger and evil spirits so soldiers would have it on their shields. Many people today get the symbol as a tattoo and it is represented in some homes.
There are many symbols very similiar or inspired by the shield knot with many more meanings. Below I have provided the links to some of my sources and more information if interested. It is a very interesting and I recommend learning about the history and the many designs of the knot.
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