Latex not parallel symbol

LaTeX function \nparallel is a mathematical symbol used to represent the non-parallel relationship between two objects or lines. This command is often used in geometry or vector analysis to show that two lines or planes are not parallel.

Command \nparallel

This function requires the amssymb package to be called in the preamble.

\usepackage{amssymb}

First example:

$a \nparallel b$

which gives $a\nparallel b$

Second example:

The lines $d_1$ and $d_2$ are not parallel:

$d_1 \nparallel d_2$

$$d_1\nparallel d_2$$