texture

Texture is the pattern created by the repetition of certain characteristics inherent in the individual letters of a type face. Texture can only exist in a line or a mass, wherever there are enough letters in an area for a textual pattern to form.
  Textual patterns often involve the interplay of two other contrasts, structure and weight. The structure of the letter determines the kind of texture and the weight detemnines the feel of the texture.
  Both of these characteristics can be emphasized or diminished by the leading, the spacing between the lines, or tracking, the space between individual letters, if the texture results from the types being viewed as a mass rather than a series of lines.