D' may resemble: D' (D + apostrophe), the contracted form of words in several languages (for example, a French indefinite article); for a full list, see the Wiktionary entry Dʼ (D + modifier apostrophe), Slavic notation for palatalised d Ď, ď in lower case (D + caron), a letter of the Czech and Slovak alphabets D′ (D + prime), used for example to represent the sensitivity index in statistics Ḋ (D + overdot) Dʻ (D + ʻokina) Dʾ (D + right half ring) Dʿ (D + left half ring)