DELTAAG is a non-existent word in English language, but its spelling can be explained using the International Phonetic Alphabet (IPA). The first two letters "DE" are pronounced as /dɛ/, while "LTA" is pronounced as /lta/. The double "A" at the end is pronounced as /a:/, which is elongated compared to the single "a" sound commonly used in English. Therefore, the phonetic transcription of DELTAAG is /dɛltæ:a:/. Even though this is not a real word, understanding IPA can aid in mastering pronunciation of unfamiliar words.