The spelling of the word "Arthen" is based on its phonetic transcription in International Phonetic Alphabet (IPA). It is pronounced as /ɑːθən/ which means that the "a" is pronounced as "ah", the "th" is pronounced as "th" in "think", and the "en" is pronounced with a schwa sound as in "taken". Therefore, the correct spelling of "Arthen" is essential to ensure its proper pronunciation. Knowing the IPA transcription of a word can also help improve one's overall pronunciation and communication skills.