Details on the recovery of the meaning of this symbol can be found in:
Physical Evidence for Ritual Acts, Sorcery and Witchcraft in Christian Britain

This is the symbol used to ward off demons in the darker places of the home and church, which I mentioned recently. Recent experiments suggest it is at least somewhat effective.
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Published by Clifford Hartleigh Low
Clifford is an accomplished practitioner of several schools of magic for thirty-five years, and holds a B.A. in Psychology from NYU. He has spent fifteen years researching Medieval and Renaissance astrological magic, and grimoires like the Picatrix. Merging his interest in dark aesthetics with deep study of historical materials, he is an outspoken proponent of wealth magic, weather magic, healing magic, tarot and black magic. His diverse influences include Hoodoo, Kabbalah, and Greco-Roman Magic. A former promoter and DJ, he sometimes enjoys throwing lavish parties.
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exactly the symbol of thunder (Perun) used in southern Poland to protect homes