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When a translation is followed by a reflection across a line parallel to the direction of translation, the resulting transformation is a glide reflection. This transformation involves moving the shape in a specified direction (translation) and then flipping it over (reflection) across a parallel line. The combination results in the shape being both translated and reflected.
Glide Reflection
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pickles...
It is a rotation.
A composite transformation which is a translation followed by a reflection in line parallel to the direction of translation
Glide reflection
translation
A translation.
translation
Parallel is a term that is usually used to describe the direction of a line. Parallel runs in the direction of north and south.
It is not!
The angle of reflection equals the angle of incidence. In regular reflection, parallel rays strike are reflected from smooth surface at the same angle in diffuse reflection, parallel rays strike and are reflected from a bumpy surface at different angles.