De (Д д; italics: Д д or Д д; italics: Д д) is a letter of the Cyrillic script. It commonly represents the voiced dental stop /d̪/, like the pronunciation of ⟨d⟩ in "door", except closer to the teeth. De is usually Romanized using the Latin letter D.
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Delta (/ˈdɛltə/ DEL-tə; uppercase Δ, lowercase δ; Greek: δέλτα, délta, [ˈðelta]) is the fourth letter of the Greek alphabet. In the system of Greek numerals, it has a value of four. It was derived from the Phoenician letter dalet 𐤃. Letters that come from delta include the Latin D and the Cyrillic Д.
A river delta (originally, the delta of the Nile River) is named so because its shape approximates the triangular uppercase letter delta. Contrary to a popular legend, this use of the word delta was not coined by Herodotus.
Transliteration is a type of conversion of a text from one script to another that involves swapping letters (thus trans- + liter-) in predictable ways, such as Greek ⟨α⟩ → ⟨a⟩ and ⟨χ⟩ → the digraph ⟨ch⟩, Cyrillic ⟨д⟩ → ⟨d⟩, Armenian ⟨ն⟩ → ⟨n⟩ or Latin ⟨æ⟩ → ⟨ae⟩.
For instance, for the Greek term ⟨Ελληνική Δημοκρατία⟩, which is usually translated as 'Hellenic Republic', the usual transliteration into the Latin script (romanization) is ⟨Hellēnikḗ Dēmokratía⟩; and the Russian term ⟨Российская Республика⟩, which is usually translated as 'Russian Republic', can be transliterated either as ⟨Rossiyskaya Respublika⟩ or alternatively as ⟨Rossijskaja Respublika⟩.
Zhe, Zha, or Zhu, sometimes transliterated as Že (Ж ж; italics: Ж ж or Ж ж; italics: Ж ж) is a letter of the Cyrillic script. It commonly represents the voiced retroflex sibilant /ʐ/ (listen) or voiced postalveolar fricative /ʒ/, like the pronunciation of the ⟨s⟩ in "measure". It is also often used with D (Д) to approximate the sound in English of the Latin letter J with a ДЖ combination. Zhe is romanized as ⟨zh⟩, ⟨j⟩ or ⟨ž⟩.