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The symbol is two parallel, vertical lines. I don't believe that it is directly related to the equal symbol; although it is possible that the vertical position was chosen precisely to avoid confusion.
They are parallel to each other.
Perpendicular is when two lines cross... Parallel is when two lines never meet.... _____________ _____________ = PARALLEL LINES If they cross they are perpendicular, if they don't, they are parallel.
If the two lines being crossed are parallel lines then the corresponding angles are equal.
2 parallel lines are lines that will never intersect