It's been mentioned before, but we have *a* reference. Near the "top" of the ancient relic is another one of those patterns (it's repeated on all 3 sides).
Although I'm not sure that it helps much.
http://imgur.com/a/yAOXt
Yes that lead me to the idea together with chris' picture.
But unfortunatly we don't have a clue what it stands for.
(just fyi: it's the same model across all pillars)
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