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Perpendicular Symbol (⊥)
Where is the "perpendicular" symbol? - Microsoft Community
Alt Code Shortcuts for Mathematical Symbols – WebNots
The "Up Tack (⊥)" Symbol in Mathematics
Insert mathematical symbols - Microsoft Support
Parallel and Perpendicular Lines in PowerPoint - YouTube
Insert a symbol - Microsoft Support
How to insert the mathematical and other symbols into the PowerPoint …
How to insert the mathematical and other symbols into the PowerPoint …
Double Vertical Bar ‖ in Word, Excel, PowerPoint and Outlook