What does the P stand for on a NGK Spark Plug?

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Tags

  1. #number
  2. #hotter
  3. #range
  4. #spark
  5. #plugs
  6. #letters
  7. #ground
  8. #higher
  9. #electrodes
  10. #after
  11. #copper
  12. #opposite
  13. #letter
  14. #indicate
  15. #things
  16. #indicates