Alif, Lam, Mim, Ra (These are the names of letters of the Arabic alphabet, and only Allah knows their meaning here). Those are the ayat (Verses, signs) of the Book and an Evident Qur'an
A.L.R. Allah, Aleem the Knower, Raziq the Provider. These are Messages of Revelation, of a discourse clear in itself and clearly showing the Truth. This is Qur'an, a plain reading and a Revelation that explains itself
Alif, Lam, Ra. (Only Allah and the Messenger [blessings and peace be upon him] know the real meaning.) These are the Verses of the (Glorious) Book and the Enlightening Qur’an
Alif-Lam-Ra. (These letters are one of the miracles of the Quran, and none but Allah (Alone) knows their meanings).These are the Verses of the Book, and a plain Quran
Alif, Lam, Ra... These (the reality and sunnatullah) are the clear signs of THIS Knowledge, the Quran.
Sayyed Abbas Sadr-Ameli
Alif 'A', Lam 'L', Ra 'R'. These are the verses of the Book and (of) a clear Qur'an (that makes things manifest) .
Al-muntakhab fi tafsir al-Qur'an al-Karim
A. (Alef), L. (lam) R. (Raa), the Surah opens with these letters introductory from the Arabic Alphabet to draw attention to the miracle of the Quran which though written in the people's tongue, cannot be emulated. These are divine prosy discoursed verses of the Book and a perspicuous Quran which stands manifest of enlightenment and imparting knowledge, wisdom and spiritual light