(noun)
a brief description of someone or something, usually in the form of a piece of film or literary work, that captures their character sharply or neatly;
e.g. They collaborated to create a cameo of life in the city.
(noun)
a section of an object that has a carving that projects from its background surface, especially a sculpture that shows this technique or a gemstone (or some other piece of jewelry) that is carved in this manner, often with the portrait of a person;
e.g. She wore a cameo pin on the lapel of her jacket.