Atmospheric optics wavelengths. A halo (ἅλως; also known as a nimbus, icebow or gloriole) is an optical phenomenon produced by the interaction of light from the sun or moon with ice crystals in the atmosphere, resulting in colored or white arcs, rings or spots in the sky. Many halos are positioned near the sun or moon, but others are elsewhere and even in the opposite part of the sky. They can also form around artificial lights in very cold weather when ice crystals called diamond dust are floating in the nearby air. There are many types of ice halos. They are produced
Bad command or file name were damaged or had illegal filenames. Later, the wording of the error message was changed for clarity. Windows NT displays the following error message instead (where "foo" is replaced by the word causing error): Some early Unix shells produced the equally cryptic "foo: no such file or directory" for the same reasons. Most modern shells produce an error message similar to "foo: command not found". Bad command or file name "Bad command or file name" is a common and confusing error message in MS-DOS and some other operating systems. COMMAND.COM, the primary user interface of MS-DOS, produces this error message