The term "Nucleolus Organiser" refers to a specific region within a chromosome that plays a critical role in the formation of the nucleolus, a vital structure within the nucleus of a cell. However, there are several synonyms for this term that provide a more descriptive or alternative way of referring to this structure. These include "Nucleolar Organizer Region," "NOR," "Armanini's Cone," and "Secondary Constriction." Depending on the context, different terms may be used by researchers or scientists to describe this important region and its role in cell biology and genetics.