Wikipedia defines flash fiction as follows:

Flash fiction is fictional work of extreme brevity that still offers character and plot development. Identified varieties, many of them defined by word count, include the six-word story, the 280-character story (also known as “twitterature”), the “dribble” (also known as the “minisaga”; 50 words), the “drabble” (also known as “microfiction”; 100 words), “sudden fiction” (750 words), flash fiction (1,000 words), nanotale, and “micro-story”.

I have put it all under the heading flash fiction.  

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