Ring above
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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.
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 overring, or in Czech Republic) 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.
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