The spelling of the word "oller" might seem a bit puzzling at first glance. However, it can be easily explained with the help of IPA phonetic transcription. In this transcription system, the letter "o" represents the sound /ɑ:/, while the letter combination "ll" stands for the sound /l/. Therefore, the word "oller" is pronounced as /ɑlər/. This might also explain why some people might spell it as "ollah" or "olla", as they are attempting to capture the phonetic sound of the word based on their individual interpretations.