Graphically, a line or many lines going vertically or horizontally in a slanting position, connecting and dis-connecting, and mirroring each other making a 'zigzag'
example:
/\/\/\/\/\/\/\/\/
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a zigzag line
zigzag
straight, curved, zigzag, and bent.
zigzag lines, vertical lines, horizontal lines, right curve, over curve,left curve, under curve, scallop lines, left slanting lines, right slanting lines
#1. Spiral Lines #2. Concave Lines #3. Horizontal Lines #4. Diagonal Lines #5. Vertical Lines #6. Broken Lines #7. Zigzag Lines #8. Concave Lines #9. Broken Lines I don't know the 10th but I am gonna research it . . .