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  1. Perpendicular Symbol (⊥)

  2. Where is the "perpendicular" symbol? - Microsoft Community

  3. Alt Code Shortcuts for Mathematical Symbols – WebNots

  4. The "Up Tack (⊥)" Symbol in Mathematics

  5. Insert mathematical symbols - Microsoft Support

  6. Parallel and Perpendicular Lines in PowerPoint - YouTube

  7. Insert a symbol - Microsoft Support

  8. How to insert the mathematical and other symbols into the PowerPoint

  9. How to insert the mathematical and other symbols into the PowerPoint

  10. Double Vertical Bar ‖ in Word, Excel, PowerPoint and Outlook