This lovely Trolley Locker Token will serve you well, very handy!
The fish's first known use as a Christian religious symbol was sometime within the first three centuries AD. Christians began using the Greek word for "fish" as an anagram/acronym for "Jesus Christ God's Son, Savior." More about this later.
The fish outline is a logical symbol for the early Christian church to adopt. Not only was fish a common food of the day, it was also used by Jesus during His ministry.