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In linear perspective there is a horizon line and a vanishing point to which all non horizontal lines lead to. There are also vertical lines. Proportion lines are simply a starting point for an artist to determine the correct proportions of the portrait or picture.
If the lines almost touch but they don't then there is no angle. There is no name for an angle that does not exist.
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Without being able to see the lines, I'm going to guess it's the Equator.
The Northern and Piccadilly lines are tube lines which have no branches at all.