What do 3 intertwined triangles mean?

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Tags

1. #interlocked
2. #variety
3. #compound
4. #norse
5. #warriors
6. #coined
7. #valknut
8. #symbol
9. #slain
10. #appears
11. #triangles
12. #peoples
13. #modern
14. #three
15. #consisting
16. #archaeological
17. #record
18. #objects
19. #germanic
20. #ancient