The words "aqua" and "cyan" are used interchangeably in computer graphics, and especially web design, to refer to a subtractive primary color electric cyan. Traditionally that color, defined as #00FFFF in hex, or (0,255,255) in RGB, is called "cyan", but X11 color names introduced the alternative name "aqua". Later, W3C popularized the name by using it in the named color palette of HTML 3.2 specifications.