Ichthys Fish

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The "Ichthys," originating from the Greek word for fish, was employed as a covert symbol among early Christians. The symbol is familiarly known as the "Jesus fish" or "sign of the fish." Its components' meanings are as follows: I (for Ichthys's first letter, Greek for Jesus), X (Chi, meaning Christ), Θ (Theta, translating to God's), Y (Upsilon, signifying Son), and Sigma (meaning Savior). Early Christians reportedly used this symbol to mark meeting places, tombs, or signal friends from foes. To identify fellow believers, one would draw half of the fish outline in the dirt; if the stranger completed the other arc, both knew they shared faith. The "Ichthys" has a rich history in Christianity and is explained further on Wikipedia.