story, play, or picture in which characters are used as symbols; fable
Allusion
a reference to something literary, mythological, or historical that the author assumes the reader will recognize
Aside
A piece of dialogue intended for the audience and supposedly not heard by the other actors on stage
Convention
A characteristic of a literary genre (often unrealistic) that is understood and accepted by audiences because it has come, through usage and time, to be recognized as a familiar technique. For example, the division of a play into acts and scenes is a dramatic convention, as are soliloquies and asides.