Nomenclature: A system of names used in a particular discipline, as in medicine and surgery, anatomy and biochemistry, etc. A standard system of nomenclature presupposes the existence of an organized classification of the entities within that field. From the Latin nomenclatura, a listing of names, from nomen, name, + calo, to proclaim.
Yangire (also referred to Cute and Psycho) is a Japanese term used to refer to normal people who suddenly become violent, sometimes due to a past trauma. Yangires are very similar to Yanderes, both are people who suffer from personality disorder and can easily become violent and extremely dangerous.
Ornamental patterns with visual similarity to the yin-yang symbol are found in archaeological artefacts of European prehistory; such designs are sometimes descriptively dubbed yin yang symbols in archaeological literature by modern scholars.