- a letter in the form of a crossed d, written đ or ð, used in Old English writing to represent both voiced and unvoiced th and in modern Icelandic and in phonetic alphabets to represent voiced th.
- a character of the runic alphabet (ð) used to represent the voiced dental fricative as in then, mother, bathe. It is used in modern phonetic transcription for the same purposeCompare theta (def. 2), thorn (def. 5)
- a variant of edh
- Ethiopia (international car registration)