"Transpondian" is a non-existent word and therefore does not have a standardized spelling or pronunciation. However, using the International Phonetic Alphabet (IPA), we can provide some guidance on how to spell this hypothetical word. IPA symbol /t/ represents the voiceless alveolar plosive "t," while /r/ stands for the voiced alveolar approximant "r." The final syllable "ian" could be spelled with IPA symbol /iən/ or /ian/, indicating the vowel sound "ee-uhn" or "ee-an." Therefore, possible spellings of "transpondian" could be "tran-spohn-dee-uhn" or "tran-spohn-dee-an."