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Provided that the metre is the same, the lines are referred to as a 'couplet'.
A point that a group of lines go through
That is referred to as the "mode".
If the sides are straight lines, then it is normally referred to as a 400-gon.
All lines of latitude are parallel to the Equator, so they are sometimes also referred to as parallels. =) Because just like parallel lines on a flat surface, any two of them are always the same distance apart and never cross each other.