They are perpendicular lines that meet to form right angles
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When two lines meet to form an angle the lines are intersecting.
An angle is formed where two lines meet. Parallel lines do not meet. Therefore they do not form an angle. So there is no angle to have a name. So no name.
They are called perpendicular.
vertex
They form an angle with a measurement of exactly 90° - that is part of the definition of :"perpendicular".