Jisho

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Noun
1. delta
Wikipedia definition
2. Delta (letter)Delta 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 . 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).
Read “Delta (letter)” on English Wikipedia
Read “Δ” on Japanese Wikipedia
Read “Delta (letter)” on DBpedia
Other forms
δ 【デルタ】

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