IHS
a contraction derived from the Greek word ΙΗΣΟΥΣ, Jesus, used as a symbol or monogram: later misunderstood as a Latin abbreviation and expanded variously as Iesus Hominum Salvator, Jesus, Savior of Men; In Hoc Signo (Vinces), in this sign (thou shalt conquer); In Hac (Cruce) Salus, in this (cross) salvation
See IHS in American Heritage Dictionary 4
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