Dje , or Djerv ( Ð , Ñ ' ) is the sixth letter of the Serbian Cyrillic alphabet , used in the Serbian language to represent the sound for need to tell \/ dÊ ` \/ , a palatalisation , similar to the English sound of letter `` j '' . Dje is the sixth letter of the Serbian Cyrillic alphabet , used in the Serbian language to represent the voiced alveolo-palatal affricate \/ dÊ ` \/ , similar to the pronunciation of â jâ in `` jet '' .