gridlines
horizantal
They are lines of longitude and latitude, often just longitudes and latitudes.
Horizontal, vertical, diagonal, curved, patterned, contour, implied, actual?
The math name for this is vertical angles.
Lines that form an X shape create vertical opposite equal angles
parallel
Very simply (and unimaginatively), the horizontal axis or x axis and the vertical or y axis.
horizontal, oblique, wavy, curve, vertical, zigzag, broken, angular, straight, dotted
Column grid lines.
They are called groups and the horizontal rows are called periods
A vertical line!
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