The word "twae" is a Scots dialectal variation of "two". In IPA phonetic transcription, it is pronounced as /twɛ/. The sound "ae" represents the diphthongization of the vowel "o" in "two". This spelling variation is used in Scottish languages, particularly in the Scots language which has its own set of pronunciation, grammar, and vocabulary. While "twae" may not be commonly used in standard English, it is an important part of the rich linguistic heritage of Scotland.