Ogonek

The ogonek, also informally referred to as the tail, is a diacritic hook placed under the lower right corner of a vowel grapheme in the Latin alphabets of Polish, Kashubian, Övdalian, and Lithuanian; and directly under a vowel in several Native American languages.

An ogonek can also be attached to the bottom of a vowel in Old Norse or Old Icelandic to show length or vowel affection. For example, in Old Norse, ǫ represents the Old Norwegian vowel [ɔ], which in Old Icelandic merges with ø ‹ö› and in modern Scandinavian languages is represented by the letter å.