The spelling of the word "Reng" can be explained by its phonetic transcription: /ɹɛŋ/. The first sound, /ɹ/, represents the English "r" sound, while the second sound, /ɛ/, represents the short "e" vowel sound. The final sound, /ŋ/, represents the consonant cluster "ng" as in "sing". Together, these sounds form the pronunciation of "Reng". It is important to pay attention to phonetic transcriptions when learning new words to ensure accurate pronunciation.