Webster's Revised Unabridged Dictionary · 1913

Monogram

Monogram , noun

[Latin monogramma; Greek mo`nos single + gra`mma letter, from gra`fein to write: compare French monogramme. See Graphic.]

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.

The monogram above, combining the letters of the name Karolvs, was used by Charlemagne.

2.
A picture in lines; a sketch. [Rare]
3.
An arbitrary sign for a word. [Rare]

monogram , transitive verb

To inscribe or ornament with a monogram.