What abbreviation can be used to describe a flying saucer?

There isn't a widely accepted abbreviation specifically for a flying saucer. The term itself is already quite concise.

However, you could use these options, depending on the context:

* UFO: Unidentified Flying Object (This is the most common and widely understood abbreviation, though it doesn't specifically refer to a saucer-shaped object)

* FS: This is a straightforward abbreviation, but it might not be as readily understood as "UFO"

* Disc: This is a general term for a flat, circular object, which could be used in a context where it's clear you're referring to a flying saucer

Ultimately, the best abbreviation depends on the specific situation and your audience.