in 19th century, ljudevit gaj proposed new letters from czech (č,ž,š,ľ,ň,ď and ǧ). the letters that were accepted were č, ž and š, and from polish, ć. for other phonemes (sounds), the digraphs that were accepted were ie, lj, nj and dž. later dj or gj was changed to đ (according to proposal by đuro daničić).