Answer:
A Glide reflection is a transformation involving a translation
and a reflection in a line parallel to the translation. Some
strip patterns (on belts or wallpaper borders) are based on
glide reflections.
A glide reflection is a type of isometry of the Euclidean
plane: the combination of a reflection in a line and a translation
along that line. Reversing the order of combining gives the
same result. The combination of a reflection in a line and
a translation in a perpendicular direction is a reflection
in a parallel line.
