Xerography - A copy process that utilizes a selenium surface and electrostatic forces to form an image. Hue of a subtractive primary and a 4-color process ink. It reflects red and green light and absorbs blue light.
X-Height - The height od the lowercase letters relative to the capitals; an important typographic concept. In the same point size, type with a greater x-height will present the illusion of being larger. For this reason, large x-heights are favored in display advertising.