Very, very short stories fall into a writing style commonly known as flash fiction, although it is also called micro-fiction or postcard fiction and the stories can be known as micro-stories.
There is no widely accepted definition of length and flash fiction competitions have word limits that range from as few as 250 words up to 1,000 words.
Flash fiction, nevertheless, often still contains the classic story elements: a protagonist, conflict, obstacles or complications and resolution. However, the limited word length can mean that some of these elements remain unwritten, they are often just hinted at or implied.
I have only recently started writing flash fiction and find it a wonderfully liberating style to write in. I hope you enjoy reading my micro-stories, they are all less than 500 words in length.