The spelling of the word "ACRPV" is determined by the International Phonetic Alphabet (IPA). In IPA, "A" represents the vowel sound /æ/, "C" represents the consonant sound /k/, "R" represents the consonant sound /r/, "P" represents the consonant sound /p/, and "V" represents the vowel sound /ə/. So, the spelling of "ACRPV" represents the sounds /ækɹpə/. Understanding IPA helps in proper pronunciation of words and emphasizes the importance of phonetics in language learning.