What is the symbol for parallel lines?

Hint: parallel lines are the lines in a plane which do not meet. they do not have any intersection point. A fixed distance is maintained between the lines. Parallel lines have the same slope. Parallel lines symbol is the symbol that should make us understand that the given lines are parallel.

Complete step by step answer:
From the question it is clear that we have to write symbols for parallel lines.
In geometry, parallel lines are the lines in the same plane that never meet at any point. These lines do not intersect.
A line is not parallel to itself, since it intersects itself infinitely often.
 Let us consider two lines, \[AB\]and \[CD\]
While doing problems it is very difficult to write \[AB\] parallel to\[CD\]in each and every step wherever required. So, we need a particular unique symbol to represent \[AB\]parallel to\[CD\]. We will insert that unique symbol between \[AB\] and \[CD\] because of this unique symbol there is no need of writing “\[AB\] parallel to \[CD\]” all the time.
\[\parallel \]this is the symbol used for representing the parallel lines.
Instead of writing \[AB\] parallel to \[CD\] all the time, using this symbol we can simply write\[AB\parallel CD\]

So now we can conclude that \[\parallel \] is the symbol used for representing parallel lines.

Note: this question is completely based upon concepts. Conceptual errors may lead to this question being wrong. Students should be conceptually strong to do this type of question right.