Ring (diacritic)

Forms and encoding

Rings occur as precomposed characters in many alphabets (for example Å and å) and as combining diacritics that may be rendered above or below a glyph. In Unicode the combining ring above and combining ring below are distinct code points and there are also precomposed letters for common usages. A typographic ring differs from a degree sign or superscript circle, which are separate symbols rather than diacritic combining marks.

Orthographic examples

Several languages use an overring as part of ordinary spelling. Common examples include:

• Å / å — a distinct letter in several Scandinavian and other languages, representing a particular vowel sound and treated as part of the alphabet rather than a simple variant of A.
• Ů / ů — found in Czech orthography to mark a long vowel that reflects historical sound changes.

Use in phonetics

In phonetic transcription the ring is used with other conventions. In particular, the International Phonetic Alphabet employs a small ring placed below a consonant to indicate voicelessness; for example, a voiceless nasal or approximant can be notated with that under-ring. When discussing the diacritic in general contexts one may refer to it simply as a ring diacritic.

History and development

Some ringed letters arose from historical ligatures or orthographic reforms. For example, the overring used in Scandinavian orthographies developed to distinguish a vowel sound and in some cases replaced earlier digraphs. Other uses reflect long-established spelling conventions that encode historical pronunciation shifts.

Typographic and practical notes

Rendering a ring correctly requires font and encoding support: the diacritic should be centered or slightly offset depending on the base letter and may need stacking with other marks. For digital text, using the standard precomposed characters where available improves interoperability; where no precomposed glyph exists, the combining ring above or below is used. Care should be taken not to confuse the diacritic with visually similar symbols such as the degree sign or superscript circle.