"ISSYSGEN" is a non-existent word in the English language, and therefore, there is no correct spelling for it. However, one could attempt to create a possible spelling using the International Phonetic Alphabet (IPA) transcription. The transcription of "ISSYSGEN" could possibly be [ɪsɪsjɛn]. This would indicate that the word has two unstressed vowels "i", a "s" sound, a palatal fricative "ʃ", and a final syllable with an "ɛ" sound and a nasal consonant "n".