Vertical is up and down and horizontal is side to side.
Think of the horizon, it is a line and horizontal has the same root.
In fact, one definition of horizontal is parallel to or in the plane of the horizon.
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XXXXXXXXX=Horizontal X X X X X X X=Vertical.
Vertical engines produce more power than horizontal engines and horizontal engine has less power than vertical engines and horizontal engines are especially designed for better mileage Not sure about mileage but the big difference is vertical shaft goes like this | and the horizontal shaft goes like this ---- . > Lower centre of gravity.
vertical is top to bottom(parallel to Y axis). horizontal is left to right(parallel to X axis).
If you remember what the horizon looks like you'll remember that horizontal stretches from left to right.
zero is horizontal, undefined is vertical