"IHS is a Christogram, that is, it’s an abbreviation for the Holy Name of Jesus. In the early centuries of the Church, writers would contract the Holy Name by using the first two letters or the first and last letters. I (iota) and H (eta) are the first two letters of the name Jesus in Greek. In the Christogram “IHS,” the third letter, S (sigma), has been added."

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Image by Hugh Hendrickson from Pixabay