  "Free-floating, non-deuterium-burning, substellar objects" are isolated
bodies of a few Jupiter masses found in very young open clusters and
associations, nearby young moving groups and in the immediate vicinity of the
Sun. They are neither brown dwarfs nor planets. I look over their nomenclature,
history of discovery, sites of detection, formation mechanisms and future
directions of research. Most free-floating, non-deuterium-burning, substellar
objects share the same formation mechanism as low-mass stars and brown dwarfs,
but there are still a few caveats, such as the value of the opacity mass limit,
the minimum mass at which an isolated body can form via turbulent fragmentation
from a cloud. The least massive free-floating substellar objects found to date
have masses of about 0.004 Msol, but current and future surveys should aim at
breaking this record. For that, we may need LSST, Euclid and WFIRST.
