The spelling of the word "heyer" follows the principle of phonetic transcription, which means that each sound in the word is represented by a specific symbol. In IPA (International Phonetic Alphabet) phonetic transcription, "heyer" is spelled as /hɛjər/. The first sound, represented by /h/, is a voiceless glottal fricative. The second sound, /ɛ/, represents the short "e" sound. The third sound, /j/, represents the "y" sound, which is a palatal approximant. The final sound, /ər/, is the "er" sound, which is a rhotic vowel.