Monogram

Part of speech: noun (n.)

1. A character or cipher composed of two or more letters interwoven or combined so as to represent a name, or a part of it (usually the initials). Monograms are often used on seals, ornamental pins, rings, buttons, and by painters, engravers, etc., to distinguish their works. Monogram.

2. A picture in lines; a sketch. [R.]

3. An arbitrary sign for a word. [R.]