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3 Fish

3 Fish
 
Which is believed to be the first early Christian symbol is taken a stage
further by combining three fish within a basic triangular shape.
Each letter for "fish" (IXOYG) represented a key word related to the
identity of Christ. He was "Jesus Christ (IX), Son of God (OY), Saviour (G)." 
 http://www.holytrinitysookebc.org/symbols.htm
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