Learned on the way to something else: "Iesus Hominum Salvator"

Wikipedia:

Because the Latin-alphabet letters I and J were not systematically distinguished until the 17th century, "JHS" and "JHC" are equivalent to "IHS" and "IHC".

"IHS" is sometimes interpreted as meaning Iesus Hominum Salvator ("Jesus, Savior of men" in Latin) or connected with In Hoc Signo. Some uses have even been created for the English language, where "IHS" is interpreted as an abbreviation of "I Have Suffered" or "In His Service". Such interpretations are known as backronyms. Used in Latin since the seventh century, the first use of IHS in an English document dates from the fourteenth century....