The spelling of the word "Philline" can be confusing for some people as it is not a common word. The correct way to spell it is with two L's, "Phil**l**ine". In IPA phonetic transcription, it is pronounced as /fɪlaɪn/. The double L in the middle represents a consonant cluster, making the "l" sound longer than usual. Knowing the correct spelling and pronunciation of words is important for effective communication, whether it be in written or spoken form.