Game of Thrones: What The White Walker Spiral Means
The Night King left a grim message in the Game of Thrones season 8 finale, featuring a spiral design that we've seen in the show before. In one of the final scenes of "Winterfell," Tormund and Beric rendez-vous with Jon's old friend "Dolorous" Edd Tollett at Last Hearth, the ancestral home of House Umber. Unfortunately, the only Umber they found was young Ned Umber, who was impaled on a wall in the center of a grisly spiral of made of severed limbs.
To make matters worse, Ned Umber was not dead but undead: turned into a wight by the Night King. Beric put him out of his misery with his flaming sword, setting fire to the spiral as well. It's been a while since the last season of Game of Thrones, so you could be forgiven for not remembering it, but this spiral has actually been in the show several times. In season 3, Jon came across some horses belonging to the Night's Watch, cut up and arranged in a similar spiral. Jon also saw the same spiral pattern carved on the walls of caves in Dragonstone.
The spiral pattern was originally attributed to the Children of the Forest, the ancient race who guided Bran in Game of Thrones season 6. In the episode "The Door," Bran sees a vision of the Children of the Forest stabbing a man (notably played by the same actor who plays the Night King, Vladimir Furdik) with a dragonglass dagger and seemingly creating the first White Walker. The White Walkers themselves then adopted the spiral as one of their symbols, using it as a way to display the bodies of their victims - including poor Ned Umber.