What are the blue downward lines in used to symbolize depression or sadness called? Does anybody have any idea what these are called?



I've only seen them referred to as blue lines so far.

I've seen them represent depression, sadness or disgust before but could someone clarify this also?
TV Tropes lists this as "Blue with Shock." This and other exaggerations originate in Manga where the lack of motion and detail makes it hard to portray a variety of emotions. To overcome this limitation authors use various simple effects to express the same meaning. This is referred to as Manga Iconography.