Purple is defined as a deep, rich shade between crimson and violet, or, more broadly, as a range of hues of color between blue and red, or as a dark color that is a blend of red and blue. According to surveys In Europe and the U.S., purple is the color most often associated with royalty, magic, mystery and piety. When combined with pink, it is associated with eroticism, femininity and seduction.

This article is about a World War II era cipher used by the Japanese Foreign Office for diplomatic communications. For World War II era ciphers used by the Japanese military, see Japanese naval codes.