Christ's Entry into Jerusalem

The Greek letters in the inscription to the left of Christ's neck form the standard Greek abbreviation of the word Christ.  (The third letter is usually formed like C in Greek, but at the end of a word has the tail that came to be a part of the corresponding letter S in the Latin alphabet.) 

On the right of his neck we see the abbreviation for the name of Jesus that came to be most common in the Latin church, the Greek letters I, H, and S corresponding respectively to the Latin letters I E (su) S.

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