The spelling of the acronym "SPPCO" can be explained using IPA phonetic transcription. The first letter "S" is pronounced as /ɛs/, followed by the letter "P" pronounced as /pi/. The double letter "P" is used to denote emphasis on the sound. Next is the letter "C," which is pronounced as /si/ and finally the letter "O" pronounced as /ou/. Together, the pronunciation is /ɛspi: si: ou/. Understanding phonetic transcription can help improve spelling skills and pronunciation.