Purple navy is a dark blue with a strong purple tint, and there are various theories about the origin of the color name.

There is a theory that purple navy was originally "purple root" and is the color of purple root dyeing, and there is a theory that this color is indigo dyed but the dark blue after dyeing has a purple tint, so it came to be called purple navy.

It is a color often used for the color of school flags and championship flags of sports such as high school baseball.