The Icelandic orthography uses a Latin-script alphabet including some letters duplicated with acute accents; in addition, it includes the letter eth, transliterated as ⟨d⟩, and the runic letter thorn, transliterated as ⟨th⟩ ; ⟨æ⟩ and ⟨ö⟩ are considered letters in their own right and not a ligature or diacritical version of their respective letters. Wikipedia