As the Greek word for a fish, Ichthus - IXOYE - 'Iota, Chi, Theta, Upsilon, Sigma,' contained the initials of the names and titles of Christ, 'Jesus Christ the Son of God, the Savior,' the figure of a fish was one of the earliest Christian symbols...
In the Greek... I - Iota - Jesus (Iesous)
X - Chi - Christ (Christos)
ƒ¦ - Theta - God's (Theou)
Y - Upsilon - Son (Huios)
‡” - Sigma - Savior (Soter)