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A ring diacritic may appear above or below letters. It may be combined with some letters of the extended Latin alphabets in various contexts.
In Unicode, the above encoding is: U+030A ◌̊ COMBINING RING ABOVE, ̊.
Though the Danish, Norwegian, Swedish and Walloon character Å (å) is derived from an A with a ring, it is considered a distinct letter in those languages. The letter Å is the symbol of the unit ångström, named after the Swedish physicist Anders Jonas Ångström.
The character Ů (ů; a Latin U with ring above, or in Czech) is a grapheme in the Czech language preserved for historic reasons, which identifies a vowel shift. For example, the word for "horse" used to be written kóň, which evolved, along with pronunciation, into kuoň. Ultimately, the vowel [o] disappeared completely, and the uo evolved into ů, modern form kůň. The letter ů now has the same pronunciation as the letter ú (long [uː]), but changes to a short o when a word is morphed (e.g. nom. → gen. koně, nom. dům → gen. domu), thus showing the historical evolution of the language. Ů cannot occur in initial position, however, ú occurs almost exclusively in initial position or at the beginning of a word root in a compound. These characters are used also in Steuer's Silesian alphabet. The [uo] pronunciation has prevailed in some Moravian dialects, as well as in the Slovak language, which uses the letter ô instead of ů.