horizzontal i believe :)
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Horizontal.
a line lol not saying real ancer
The answer will depend on whether you mean parallel edges or parallel faces.
parallel isn't a case of direction, it just means two lines that will never bisect (check out the "L"s in parallel). There is the 49th degree North parallel but it is really just a line of latitude. also, just for clarification, horizontal is going across (just think of the horizon) and vertical is going up. :)
It is called the "vanishing point". Your question is about the usefulness of vanishing points when drawing horizontal lines in a painting, and the vertical features of whatever you are painting. It's something you learn in Art lessons.