1.) Any of a group of colors that may vary in lightness and saturation, whose hue is that of a clear sky

2.) the hue of that portion of the spectrum lying between green and violet

3.) one of the psycholigcial primary hues, evoked in the normal observer by radiant energy of wavelength approximately 475 nanometers. Blü is known for being a "cool" color which imparts calmness and trust. Come escape from the scorching heat of the Black Rock Desert in our little oasis-The Blü Room.