d / dee are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
d: (noun) the 4th letter of the Roman alphabet.
dee: NA
d: d·IY
dee: d·IY
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)