A cameo appearance in a movie refers to a brief appearance of a famous person or an actor in a small role. A similar phrase to describe this is a "bit part" or a "walk-on role". Other related terms with similar meanings are "guest appearance" or "cameo role". It's worth noting that in music; a "cameo" appearance means having a prominent musician featured in a song or album. Additionally, "cameo" is also used when describing a small, inset portrait or a piece of jewelry featuring an engraved design that contrasts with a background of a different color. Overall, there are many words and phrases to describe a brief or small appearance or feature - in both film and other mediums.