What does this sign mean in Game of Thrones

[Ja Sa Bong]

Game of Thrones is among my favourite TV show. I have watched it countless times and if given the chance to watch it again, I will without any doubt. There's something I can't still understand in the show which was used severally by the night king which is a sign he makes with arrangement of dead bodies like a circle. There's no reference whatsoever in the show what it means. I'm not sure if it's mentioned in the book.

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Does anyone have an idea what that sign signifies?

 

[judel]

I found this at https://winteriscoming.net/2019/04/19/what-does-the-night-kings-spiral-actually-mean/

As we saw with Bran and the Three-Eyed Raven, the spiral pattern was sacred to the Children of the Forest, who created the Night King by sacrificing a captured man in a spiral “henge of stones.” The Night King then adopted the symbol as a sort of blasphemy, like Satan with the upside-down cross.