The spelling of the word "Penee" may seem strange to those unfamiliar with the IPA phonetic transcription. In IPA, "Penee" is pronounced /pɛniː/. The "n" sound is followed by a double "e" which indicates a longer vowel sound. This is known as a diphthong, which is a combination of two vowel sounds. The spelling of "Penee" accurately represents its pronunciation in IPA, which is why it may look unusual to those used to traditional English spelling.