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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.
This function requires the amssymb package to be called in the preamble.
$a \nparallel b$
$$a \nparallel b$$
The lines $d_1$ and $d_2$ are not parallel:
$d_1 \nparallel d_2$
$$d_1 \nparallel d_2$$