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The word "Chrismon" comes from the words "Christ" and shortened form of "monogram" and are symbols (or ornaments) used to represent various concepts and ideas in Christianity.
2. In His Service
The Chrismon "IHS" is often taken to say "In His Service".
"ΙΗΣΟΥΣ" ≈ "Jesus" which, in English, is "IHSOUS". The first three letters are (uppercase) "IHS" or (lowercase) "ihs".