also: ディ
noun
The letter D/d itself, used as a symbol, grade, musical note, or in abbreviations.
成績はＡ、Ｂ、Ｃ、Ｄの４段階です。
Grades are on a four-level scale: A, B, C, D.
この曲はＤメジャーで始まる。
This piece starts in D major.
noun
Colloquial abbreviation for ディレクター (director), used in film, TV, or project contexts.
今回のＣＭは、あの有名なＤが手がけたらしい。
I heard that famous director worked on this commercial.
Full-width lowercase d; less common than uppercase.
Full form of 'director'; D is a casual abbreviation used mainly in industry jargon.
From English letter name 'dee' and abbreviation of 'director'.