What is the White Walker symbol?

Related questions

1. Why did Jon kill qhorin Halfhand?
2. Who did Jon Snow kill first?
3. What is the symbol the night King left?
4. What does ygritte say to Jon Snow?
5. What was the symbol the night King left?
6. Is Jon Snow brother to the Dragon Queen?
7. Who killed qhorin Halfhand?
8. What does the White Walker spiral symbol mean?
9. Why did ygritte shoot Jon Snow?
10. What episode does Jon Snow and Ygritte make love?

Tags

1. #driving
2. #forest
3. #night
4. #heart
5. #dragonglass
6. #children
7. #tying
8. #white
9. #created
10. #first
11. #walker
12. #present
13. #through
14. #weirwood
15. #dagger
16. #symbol