Dictionary of Ichthyology  

ichthus = 2) an iconographic symbol for Christ from the initials in the Greek phrase Iesous Christos Theou Huios Soter (Jesus Christ Son of God Saviour, ιχθύς in Greek); or representing Jesus as a fisher of men.

Car sign. Photograph by Brian W. Coad.

Canadian Museum of Nature
www.briancoad.com