Real examples for parallel lines

railway tracks, an equals sign ( = ) or the ribs on a central heating radiator.

A single line can't be parallel, unless there's another line present.

The edges of the question box across from each other.

| |

| |

Yes, the two letters 'el' in the Word 'parallel'. Also, a pair of railroad tracks. Parallel lines never travel alone.

It is very likely to have the thing you are looking at (the screen) having as least 2 parallel lines.