The common periwinkle or winkle (Littorina littorea) is a species of small edible sea snail, a marine gastropod mollusc that has gills and an operculum, and is classified within the family Littorinidae, the periwinkles. This is a robust intertidal species with a dark and sometimes banded shell. It is native to the rocky shores of the northeastern, and introduced to the northwestern, Atlantic Ocean. == Description == The shell is broadly ovate, thick, and sharply pointed except when eroded. The shell contains six to seven whorls with some fine threads and wrinkles. The color is variable f...

Periwinkle is a color in the blue and purple family. Its name is derived from the lesser periwinkle or myrtle herb (Vinca minor) which bears flowers of the same color. The color periwinkle is also called lavender blue. The color periwinkle may be considered a pale tint of blue or a "pastel blue". The first recorded use of periwinkle as a color name in English was in 1895. == In popular culture == Periwinkle blue is the color for esophageal and stomach cancer awareness ribbons, and for anorexia nervosa and bulimia. It is also the color for pulmonary hypertension awareness ribbons. The 'downvote...