What does PI mean in knitting?

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Tags

1. #double
2. #slip1
3. #meaning
4. #stitches
5. #fabric
6. #outside
7. #twist
8. #stitch
9. #meant
10. #cross
11. #rounds
12. #called
13. #slipped
14. #right
15. #strands
16. #circular
17. #shown
18. #knitting
19. #decrease