\parallelThe \parallel symbol is used to denote parallelism between two lines or vectors in geometry and linear algebra. It indicates that two lines or vectors are parallel to each other, meaning they have the same direction or are aligned in the same plane without intersecting.
Line AB is parallel to line CD in geometry.
AB \parallel CDVector v is parallel to vector w, indicating they have the same or exact opposite direction.
\vec{v} \parallel \vec{w}Line l1 is parallel to line l2, often used in geometric proofs and theorems.
l_1 \parallel l_2