Scots (Scottish Gaelic: Albais) is the Germanic language variety spoken in Lowland Scotland and parts of Ulster in Ireland (where the local dialect is known as Ulster Scots). It is sometimes called Lowland Scots to distinguish it from Scottish Gaelic, the Celtic language that was historically restricted to most of the Highlands, the Hebrides and Galloway after the 16th century. The Scots language developed during the Middle English period as a distinct entity. Scots is recognised as an indigenous language of Scotland, a regional or minority language of Europe and as a vulnerable language by UNESCO. As there are no universally accepted criteria for distinguishing a language from a dialect, scholars and other interested parties often disagree about the linguistic, historical and social status of Scots and particularly its relationship to English. Although a number of paradigms for distinguishing between languages and dialects exist, they often render contradictory results. Broad Scots is at one end of a bipolar linguistic continuum, with Scottish Standard English at the other. Scots is often regarded as one of the ancient varieties of English, but it has its own distinct dialects. Alternatively, Scots is sometimes treated as a distinct Germanic language, in the way that Norwegian is closely linked to but distinct from Danish. In the 2011 Scottish Census, 1.5 million people in Scotland reported being able to speak Scots.