In Icelandic, ð represents a voiced dental fricative, as in th in English "them". In the Icelandic and Faroese 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). Edh was usually used when the diagraph was voiced (as in "the" or "that"). In Middle English, ð was no longer used.

Lower-case edh is used as a symbol in the International Phonetic Alphabet, again for a voiced dental fricative.

See also: Þ, Yogh, Œ

Some other languages have a letter that looks very similar to Ð. For instance there is the Croatian letter Đ (Latin capital letter D with stroke), for which the lowercase is đ. There is also Ɖ (Latin capital letter African D). These are in fact separate letters which just happen to be written almost the same, much like the old abbreviation for the Soviet Union СССР (SSSR) happens to resemble Latin CCCP.