Fictional units are imaginary measurements or entities created within a story or narrative. They can include anything from made-up currencies, like the Galleon in the Harry Potter series, to unique time measurements, such as the TARDIS time travel units in Doctor Who. These units help to build the world and enhance the storytelling by providing a sense of realism and consistency. These units often serve specific purposes in their respective narratives, allowing characters to interact with their environment in a way that feels authentic. By establishing these fictional units, authors can engage readers more deeply, making the story's universe more immersive and relatable.