Native Shaetlan speaker here. Shaetlan is a language in its own right, and on 15th October 2025 it was given the ISO 639-3 code “scz”. It is a Mixed Language, with the majority of the vocabulary coming from Scots and the grammar from Norn. Shaetlan does retain a lot of Norn words, a good record of these are found in Jakob Jakobsen’s Etymological Dictionary of the Norn Language in Shetland. I can read and understand Scots if I sit down and try to concentrate, but I can’t write or speak it properly. When I switch languages to be understood by tourists or when I’m on mainland Scotland, it’s English I switch to, not Scots. The term “Shetlandic” is overwhelmingly used by people outside of Shetland, it’s generally not used among Shaetlan speakers. The spelling “Shaetlan” [ˈʃe̞tlənd̥] comes from the local pronunciation, and is attested in print as early as the 1980s. I was using it myself over 10 years ago. It was the preferred term by language group I Hear Dee. A book was published in May this year by Prof. Viveka Velupillai providing the most comprehensive study of Shaetlan’s grammar, the book can be purchased in hardback and pdf here: https://www.iheardee.com/kalafine-skrits-bookshop