 The "O caudata" of Old Norse (letter "ǫ", with "ǫ́") is used to write the open-mid back rounded vowel, .Medieval Nordic manuscripts show this 'hook' in both directions, in combination with several vowels.Despite this distinction, the term 'ogonek' is sometimes used in discussions of typesetting and encoding Norse texts, as "o caudata" is typographically identical to o with ogonek.