Pierre
William first used the symbol for parallel.
William Jones first used the pi symbol (π) in 1706
It is the symbol for 'perpendicular'.
An inverted capital T
perpendicular lines form a right angle at their intersection so draw the right angle symbol at the intersection
Pierre
An inverted "T"
ABâ”´CDThe symbol for perpendicular in mathematics is an inverse T
William first used the symbol for parallel.
Pythagoras was the 1st person who used the pi symbol first
Two lines that are not parallel are perpendicular. The symbol is +.
It is the symbol for 'perpendicular'.
William Jones first used the pi symbol (π) in 1706
"why" is not a mathematical symbol.
The first time the symbol Pi was first used for Pi was in ancient Greece in their numbers. The symbol "π" was number 80 in Greece.
┴ that one. Sometimes it'll have a small square to indicate a right angle.
It is a vertical line touching a horizontal line