The preferred term these days in non-tinfoil hat circles is UAP (Unidentified Anomolous Phenomenon) specifically to address the problem of these “things” being

The preferred term these days in non-tinfoil hat circles is UAP (Unidentified Anomolous Phenomenon) specifically to address the problem of these “things” being observed (and therefore possibly merely optical) phenomena that are not necessarily (and are certainly not verifiably) objects at all.