The spelling of the word "robiul" can be explained using IPA phonetic transcription as /roʊ.bi.jʊl/. The first syllable "ro" is pronounced as "roʊ" with a long "o" sound. The second syllable "bi" is pronounced as "bi" with a short "i" sound. The third syllable "ul" is pronounced as "jʊl" with a "yoo" sound followed by a light "l" sound. It is important to use accurate spelling and phonetics for proper communication and understanding in any language.