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https://www.mathopenref.com/perpendicular.html
https://www.rapidtables.com/math/symbols/Geometry_Symbols.html
https://mathematica.stackexchange.com/questions/46538/parallel-and-perpendicular-symbol-from-mathematica-to-latex
https://en.wikipedia.org/wiki/Up_tack
https://www.youtube.com/watch?v=VVvErpLG2EQ
https://www.mathsisfun.com/geometry/symbols.html
https://www.mathsisfun.com/definitions/perpendicular-lines.html
https://www.math-only-math.com/perpendicular-lines.html
https://www.cliffsnotes.com/study-guides/geometry/fundamental-ideas/lines-intersecting-perpendicular-parallel
https://www.khanacademy.org/math/basic-geo/basic-geo-angle/angles-between-lines/v/identifying-parallel-and-perpendicular-lines
https://www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/perpendicular-lines
https://www.khanacademy.org/math/basic-geo/basic-geo-lines/parallel-perp/v/parallel-and-perpendicular-lines-intro