The line q r winds about a line.
It is called a spiral line.
The line w x winds about a point.
It also is called a spiral line.
A spiral line is one that winds about a line or point.
The line 7 8[[1]] looks like waves.
[1]. To be read seven, eight, not seventy-eight.
It is called a wave line.
What kind of a line is a b?