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The signs have a religious significance coming from the symbolism of these centuries. They come from the Christ's Anagram expressed in the Trinitarian’s Chrismon which symbolically represents the Trinity, each one of the three persons Father, Son and Holy Spirit and Alpha/Omega. These signs appear in the Romanesque initiated by the Order of Cluny and they reflect the spiritual concerns of the late eleventh century until the middle of the thirteenth century, all the Romanesque period. To understand these issues better, I’ll refer to history.
Read more in The stonemason’s signs in the Romanesque churches in Spain.