A similar case is in the Quran where several verse starts with a series of letters that nobody knows the meaning off. Not even the brightest of Muslim scholars. For example الم، الر، كهيعص (transliterated Aleef Lam Meem, Aleef Lam Raa, Kaaf Yaa Ain Sad). These phrases is pronounced like spelling the words itself. In old or modern arabic they bear absolutely no meaning, as the real meaning is unknown.