This design is based on the number 4 which corresponds to form, solidity, Earth, manifestation and grounding. Shields have been used by many traditions to give the bearer a sense of protection from some outside force.
In a more spiritual interpretation they can serve as reminders of the inner protection which comes from being connected to source energies, be they physical or non-physical.
Open your heart and receive the gifts of the spirit - it is the gift of your Self.
