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Eth (, uppercase: Ð, lowercase: ð; also spelled edh or eð), known as ðæt in Old English, is a letter used in Old English, Middle English, Icelandic, Faroese (in which it is called edd), Khmer and Elfdalian.
It was also used in Scandinavia during the Middle Ages, but was subsequently replaced with dh, and later d.
It is often transliterated as d.
The lowercase version has been adopted to represent a voiced dental fricative in the International Phonetic Alphabet.
== Old English ==
In Old English, ð (called ðæt) was used interchangeably with þ to represent the Old English dental fricative phoneme...