In Icelandic, ð represents a voiced dental fricative, as in th in English "them". In the Icelandic and Faeroese alphabets, ð follows d. In Anglo-Saxon, ð may represent the same sound as in Icelandic, or the voiceless th of "thread", both of which were also represented by thorn (þ). In [Middle English]?, ð was no longer used.
Lowercase edh is used as a symbol in the International Phonetic Alphabet, again for a voiced dental fricative.