Detail of “I.H.S” Christogram from the triple light stained glass window by Ferguson & Urie at St. John’s Anglican Church, Digby, Victoria, Australia.
Photo: Ray Brown 9 Jan 2011.

IHS:
Dating from the 8th century, this is an abbreviation for “IHESUS,” the way Christ’s Name was spelled in the Middle Ages (despite popular belief, the monogram stands neither for “Iesus Hominum Salvator” –“Jesus Saviour of Men” — nor for “In His Service.”) Popularised by St. Bernardine of Siena, the monogram was later used by St. Ignatius of Loyola as a symbol for the Jesuit Order.