it means the norm, or the length of something is zero.
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parallel lines never intersect.
Parallel lines NEVER touch, so zero.
Zero; they never intersect and therefore they do not have a solution.
A heptagon contains zero parallel lines. All of the lines in a regular heptagon with all sides and angles equal are at different angles from each other.
It has no paralel lines. A paralel line are two lines that never cross. If you notice, in a trinagle all lines are touching all other lines.