The combined structure and style of a letter or Glyph, its physical form. Basic Latin letterforms consist of the letters a to z, and A to Z, and the Arabic/Indian numerals 0 (zero) to 9. Letterform is analogous to letter structure.

Letterforms are represented by sub-types. For example, capital Latin A letterform is a triangular structure mirrored by its gothic counterpart letterform, the straight-sided loop top A. In Roman types, the triangular lowercase v letterform has an alternate cursive v letterform. Each is treated as a ditinct letter form or structure.