Eth (Ð, ð; also spelled edh or eð) is a letter used in Old English, Icelandic, Faroese (in which it is called "edd"), and Dalecarlian. It was also used in
Scandinaviaduring the Middle Ages, but was subsequently replaced with "dh" and later " d". The capital eth resembles a D with a line partially through the vertical stroke. The lowercase resembles an insular d with a line through the top.
The letter originated in Irish writing (Freeborn 1992, 24) as a "d" with a cross-stroke added. The lowercase version has retained the curved shape of a
medievalscribe's "d", which "d" itself in general has not (but see for instance the Audilogo).
In Icelandic, "ð" represents a
voiced dental fricativelike "th" in English "them"; however, the name of the letter is pronounced "eþ", i.e., "voiceless", unless followed by a vowel. It has also been labeled an "interdental fricative." [ [http://dictionary.reference.com/search?q=eth American Heritage Dictionary] ]
In Faroese, "ð" isn't assigned to any particular phoneme and appears mostly for etymological reasons; however, it does show where most of the Faroese glides are, and when the "ð" is before "r" it is in a few words pronounced as IPA| [g] . In the Icelandic and Faroese
alphabets, "ð" follows "d".
Olav Jakobsen Høyem's version of Nynorskbased on Trøndersk, the "ð" is always silent and is introduced for etymological reasons.
In the orthography for
Elfdalian, the "ð" represents a voiced dental fricativelike "th" in English "them", and it follows "d" in the alphabet.
In Old English, "ð" (referred to as "ðæt" by the Anglo-Saxons) was used interchangeably with þ (thorn) to represent either voiced or voiceless dental fricatives. The letter "ð" was used throughout the Anglo-Saxon era, but gradually fell out of use in
Middle English, disappearing altogether by about 1300Fact|date=July 2007; "þ" survived longer, ultimately being replaced by the modern digraph "th" by about 1500.
The "ð" is also used by some in written Welsh to represent the letter 'dd' (the voiced dental fricative).
Lower-case eth is used as a symbol in the (IPA), again for a
voiced dental fricative, and in IPA usage, the name of the symbol is pronounced with the same voiced sound, as IPA|/ɛð/. (The IPA symbol for the voiceless dental fricative is θ.)
Unicodeuniversal character encoding standard, upper and lower case eth are represented by U+00D0 and U+00F0, respectively. These code points are inherited from the older ISO 8859-1standard. In HTML, eth is represented by the Latin character entities
UNIX-like systems such as Linuxit can be entered with the Compose keyplus d and - or D and - for the uppercase version when using ISO8859-based locales or Compose keyplus d and h or D and h for uppercase version when using UTF-8-based locales.
Microsoft Windows, one can hold Alt while typing 0208 or 0240 on the numeric keypad to produce the uppercase and lowercase forms, respectively. The US-International keyboard layout allows the letter to be entered by holding AltGrand pressing the letter "d."
* The letter "ð" is sometimes used in
mathematicsand engineeringtextbooks as a symbol for a spin-weighted partial derivative. This operator gives rise to spin-weighted spherical harmonics.
* The modern Greek letter delta (
Δ, δ) has, in general, the same phonetic value, and "ð" is the only Latin alphabetletter faithfully representing delta's phonetic value. (In Ancient Greek delta represented a d sound).
* The symbol is mentioned in the Rush song "
By-Tor and the Snow Dog" in the first verse:
Prince By-Tor takes the cavern to the North light,
The sign of Eth is rising in the air.
* Freeborn, Dennis (1992). "From Old English to Standard English". London: MacMillan.
D with stroke
* [http://briem.ismennt.is/2/2.11/2.1.3.eth.cap.htm How to make the Eth]
* [http://www.alvdalen.se/alvdalska/alvdalsk_ortografi.pdf Förslag till en enhetlig stavning för älvdalska (March, 2005)] sv icon
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