Dwarf rabbit refers either (formally) to a rabbit with the dwarfing gene, or (informally) to any small breed of domestic rabbit or specimen thereof, or (colloquially) to any small rabbit. (Wikipedia)(See all definitions)
If you live in a small space and can not afford to buy a big cage for your bunny, you might want to consider getting a smaller breed of rabbit like the dwarf rabbit.
The breed originated in Belgium, where it is rumored that a rabbit breeder was trying to create a long-coated dwarf rabbit, and ended up with what is now the «mane» gene mutation by accident.
Pets International (Central Garden & Pet) Kaytee Barn Habitat with Silo The Kaytee Barn Habitat for guinea pigs and dwarf rabbits features a functioning hay-dispenser silo.