Flash fiction is fiction characterized by its extreme brevity. While there is no universally accepted exact word limit, generally a short story is considered to constitute flash fiction if it is less than 1,000–2,000 words long, and most flash-fiction pieces are between 250 and 1,000 words long. (By contrast, "traditional" short stories range from 2,000 words to upwards of 20,000, and are mainly between 3,000 and 10,000 words long; they are distinguished from longer forms, such as the novel and novella, primarily by the intent that they be read in a single sitting.)
Other names for flash fiction include sudden fiction, microfiction, micro-story, postcard fiction, and short short story, though distinctions are sometimes drawn between some of these terms; for example, sometimes 1,000 words is considered the cut-off between "flash fiction" and the slightly longer "sudden fiction".
The term "flash fiction" likely originated in James Thomas', Denise Thomas', and Tom Hazuka's 1992 anthology of that title. As the editors said in their introduction, their definition of a "flash fiction" was a story that would fit on two facing pages of a typical digest-sized literary magazine, or about 750 words.
One type of flash fiction is the short story with an exact word count. Examples include 55 Fiction, the Drabble and the 69er. Nanofictions are complete stories, with at least one character and a discernible plot, exactly 55 words long. A Drabble is a story of exactly 100 words, excluding titles, and a 69er is a story of exactly 69 words, again excluding the title. The 69er was a regular feature of the Canadian literary magazine NFG, which featured a section of such stories in each issue. Short story writer Bruce Holland Rogers has written "369" stories which consist of an overall title, then three thematically related 69ers, each with its own title.