In the RGB color model, the "C" stands for the color cyan. RGB, which stands for Red, Green, and Blue, is an additive color model used primarily in electronic displays. When combined in various intensities, these three colors create a spectrum of colors that can be seen on screens. In this model, cyan results from mixing equal parts of green and blue light while excluding red. Cyan is a bright, vibrant color often associated with the color of clear skies and tropical waters. This color is also widely used in print and design, particularly in the CMYK color model where it represents one of the key inks.