The spelling of the word "DACON PB" may seem a bit confusing at first glance, but it can be easily explained using the International Phonetic Alphabet (IPA). The first syllable of the word, "DA-" is pronounced /deɪ/, with a long "a" sound. The second syllable is "CON", which is pronounced /kɒn/, with a short "o". The final syllable, "PB", is pronounced /piː.biː/, with a long "i" sound and a short "e" sound. So the correct spelling of "DACON PB" reflects the sounds heard in the word's pronunciation.