Brown dwarfs are substellar objects[1] Perhaps if it doesn't make it as a star, then it's not binary? It's not quite a planet system, but maybe one can call it

Brown dwarfs are substellar objects[1] Perhaps if it doesn't make it as a star, then it's not binary? It's not quite a planet system, but maybe one can call it a "Solar system"? [1] https://en.wikipedia.org/wiki/Brown_dwarf https://en.wikipedia.org/wiki/Brown_dwarf This might be interesting. In the same article, they call a pair of brown dwarves a "a binary system" rather than a binary star.