Duke Blue is a very specific shade of blue, often associated with the Duke University in North Carolina. However, this particular shade of blue can be described using various synonyms. For instance, some people may refer to it as royal blue or navy blue. Others may associate it with deep blue or even cobalt blue. Similarly, some may use ultramarine blue or sapphire blue to describe this unique color. Nonetheless, no matter what word one may use, all these shades describe the bright and bold blue color of Duke University. This hue is often seen as a representation of excellence, loyalty, and tradition.