This is the symbol in red:
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From Wikimedia:
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3Hexagram 63 - Already Fording en.m.wikipedia.org/wiki/… – FuzzyBoots Oct 11 '18 at 0:06
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I'm voting to leave open as it has importance on a character level. As it isn't too SF/F specific, I recommend migrating it to Movies & TV as that seems to be a better fit. – Meat Trademark Oct 11 '18 at 18:23
The symbol is tattoed on the Arashikage Ninja Clan members upon graduation.
It is the hexagram #63 symbol for Already Fording ("after completion" and "already completed" or "already done"), composed by the Ba gua triagrams for water (on top) and fire.
It originally appears on G.I. Joe: A Real American Hero #21 (March 1984) starring Snake Eyes and Storm Shadow.
- I Ching symbols on Wikipedia
- G.I. Joe: A Real American Hero #21 Review and scans at majorspoilers.com
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1If you want to add it in, apparently it's usually tattooed on an Arashikage arm in that location on graduation. – FuzzyBoots Oct 11 '18 at 10:52
