The spelling of the word "Rithisak" is unique and can be confusing in terms of pronunciation. Using the International Phonetic Alphabet (IPA), the correct pronunciation would be /rɪθɪsæk/. This means that "ri" is pronounced as "rɪ", "thi" as "θɪ", and "sak" as "sæk". The "th" sound represented by the symbol "θ" is often pronounced as "t" or "f" by non-native speakers. Therefore, it is important to use the correct IPA transcription to ensure accurate pronunciation of the word "Rithisak."