* Microfiction: Often considered the smallest category, with stories under 100 words.
* Flash Fiction: Typically ranges from 100-1000 words.
* Nano Fiction: This is a bit more flexible, but most fall between 10-100 words. Some definitions even include stories of just a single sentence!
The key point is that nano fiction is all about conciseness and impact. It forces writers to be incredibly efficient with their language, leaving a lasting impression in a short space.