Is zig zag a quality of a line

In a way yes

Explanation:

The word zigzag describes the shape of a line. A line drawn in a zigzag shape makes a lot of short, sharp turns. The letter Z is a zigzag itself, and a thunderbolt is also often represented as a zigzag. The first turn a zigzag line makes is called a zig, and the second is called the zag.

Hope this can clear the air a little bit hun.