\shortparallelThe \shortparallel symbol is used to denote parallelism in geometry and vector notation. It is often used to indicate that two lines or vectors are parallel to each other.
Indicates that line AB is parallel to line CD.
AB \shortparallel CDIndicates that vector v is parallel to vector w.
\vec{v} \shortparallel \vec{w}Indicates that line l1 is parallel to line l2.
l_1 \shortparallel l_2