The term non-humanoid designated lifeforms which did not share certain morphological, biological, and physiological traits with humanoids and could exist in a wide variety of types. A nitrogen sulfide atmosphere was considered an indicator of non-humanoid life. (ENT: "Broken Bow") Relations among humanoid species were considered easier than between a humanoid and a non-humanoid one since those lacked a common point of reference to base communications on. (TNG: "The Ensigns of Command" )