Both the World Science Fiction Society and the Science Fiction and Fantasy Writers of America define a novelette as a work of fiction between 7500 and 17500 words long. A novella is longer, a novel is longer still, and a short story is shorter.

With dead-tree books, potential customers get an instant impression of the length of a book by its volume. For eBooks, some sellers such as Smashwords list a word count with every book, but others, such as Amazon, do not. (Amazon gives a file size, e.g. 91 KB, which doesn't tell you anything about length because the bulk of file size may be images or formatting. One high-resolution cover image, for example, can be as large as the plain text of a hundred pages.)

I feel it's important to give potential customers an idea of the volume of the work they are buying, so I call "President Park Incidents" a novelette, and put it on the cover.