The vertical line in a pedigree chart means the next generation
so-
MOM DAD
+
+ + means vertical line
+
Son & Daughter
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grid lines
Grid lines.
I think {grid or grid lines} is the term you're looking for.
Non-vertical lines could be slanted or horizontal.
horizontal lines are lines which may be at the angle of 00,1800,3600.if vertical lines stand on horizontal lines it is in the angle of 900