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[–][deleted] 4 insightful - 2 fun4 insightful - 1 fun5 insightful - 2 fun -  (1 child)

Early Christians used the fish.

[–]Tom_Bombadil 2 insightful - 2 fun2 insightful - 1 fun3 insightful - 2 fun -  (0 children)

Yep. An ingenious sign for the early secret society.

Two people facing each other.

One would draw an arc in the sand with their foot.

If the other person was "in the know" then they would add another arc beginning at the stating point of the first arc and crossing the arc somewhere in the middle of the first arc.

The two combined arcs create the fish symbol that is now commonly recognized.

Similar to a secret handshake.

If the other person wasn't "in the know", then they probably wouldn't notice the first arc. Or at best would notice, but not understand.