In geometry, the perpendicular symbol is used to show that two lines are perpendicular to each other. Typically the perpendicular symbol is used in an expression like this:
In plain language, this means that the line is perpendicular to the line . Read more…
The right tack symbol.
The left tack symbol.
Raised interpolation marker
The symbol for two perpendicular lines is a horizontal line with another line drawn perpendicular to it.
A perpendicular angle is visually denoted by drawing a square at the vertex of the angle. The measured angle is equal to π/2 radians or 90°.