What do you call a short story with less than 1000 words?

Excuse me, I'm curious about something. I've been reading some literature lately and came across the idea of a short story, but I'm a bit confused about the definition. Specifically, I'm wondering what term is used to describe a short story that has less than 1000 words? Is there a specific name for this type of literary work, or does it simply fall under the broader category of short stories? I'd appreciate any clarification you can provide.