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Delta (letter)
Delta (uppercase Δ, lowercase δ or 𝛿; ''Délta''; Modern Greek (:ˈðelta)〔(【引用サイトリンク】title=Dictionary of Standard Modern greek )〕) is the fourth letter of the Greek alphabet. In the system of Greek numerals it has a value of 4. It was derived from the Phoenician letter dalet .〔http://www.merriam-webster.com/dictionary/delta〕 Letters that come from delta include Latin D and Cyrillic Д.
A river delta (originally, the Nile River delta) is so named because its shape approximates the upper-case letter delta (the shape is a triangle). Despite a popular legend, this use of the word ''delta'' was not coined by Herodotus.
==Pronunciation==
In Ancient Greek, delta represented a voiced dental plosive . In Modern Greek, it represents a voiced dental fricative , like the "th" in "that" or "this". It is romanized as ''d'' or ''dh''.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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