William first used the symbol for parallel.
Two lines that are not parallel are perpendicular. The symbol is +.
William Oughtred(1574-1660) was the first to use the symbol for parallel.
parallel
The answer is ""
The symbol is two parallel, vertical lines. I don't believe that it is directly related to the equal symbol; although it is possible that the vertical position was chosen precisely to avoid confusion.
Three vertical parallel lines: |
There is no symbol for intersecting lines.Other symbols incude:perpendicular ⊥parallel
William oughtred
Two lines are parallel when they are perfectly straight, side by side. Train tracks for example. The symbol for parallel is: (I.E. AB)
definition:Parallel line are two straight lines that never meet.
Two vertical lines, next to each other.