Ok I have been asking this question a lot on peoples' blogs and know one can tell. The Night King ( what they call him in the show) was once a human as we have seen. He is wearing a chain mail type of armor. On his chest or closer to his neck is a warn out metal emblem. When I zoom in a few of these photos I feel like a might see something but it to hard to tell.
So if you have any ideas please let me know. I want to know if it will tells us something.

Comments (8)
The sigil is a crow skull that represents the Nightfort, the most creepy and ancient Castle of the Night's Watch
Reply to: The Night's Queen
To me resemble to this..
Reply to: The Night's Queen
Ok I know it's this way in the book but I feel like in the show the Night King ( not Night's) maybe different. I am hoping your right and even if they don't explain it in the show it's a nod to book readers!
Reply to: mrScottie301
We shall see..i'm also very curious how they will explain it in the show. Finger crossed
Doesn't look like any northern sigil who everyone and anyone believes he was...however maybe since being transformed it changed his way into creating his own sigil or to represent his army
Maybe