Picture (Source): astockly
Description (Source): Kyle McNicoll
"A wallpaper style pattern is a pattern that extends indefinitely both vertically and horizontally or in other words, two directions. This type of pattern can have up to 17 different classifications. This specific pattern is designated, as PMM because it’s smallest possible rotational pattern is 180 degrees. The pattern also has reflections in two directions and all of the rotational points fall on a reflection line."
Edits by Kelsey Goodwin: Additionally this pattern has glide reflection because the pattern reflects over an axis and is then translated to the one side.
Link: http://math125fall2014.blogspot.com/2014/09/wallpaper-pattern_63.html#comment-form
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