An isocyanide (also called isonitrile or carbylamine) is an organic compound with the functional group -N≡C. It is the isomer of the related cyanide (-C≡N), hence the prefix iso. The organic fragment is connected to the isocyanide group via the nitrogen atom, not via the carbon.
Read more about Isocyanide: Nomenclature, Physical Properties, Synthesis of Isocyanides, Reactions, Naturally Occurring Isocyanides