(Alef), L. (lam) R. (Raa), the Surah opens with these letters introductory

﴿الٓرۚ تِلۡكَ ءَايَٰتُ ٱلۡكِتَٰبِ وَقُرۡءَانٖ مُّبِينٖ ﴾
[الحِجر: 1]

(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

﴿الر تلك آيات الكتاب وقرآن مبين﴾ [الحِجر: 1]

Dr Kamal Omar
L. R. These are the signs in Al-Kitâb and Qurânum Mobin

Dr Laleh Bakhtiar
Alif L[m R[. That are the signs of the Book and of a clear Recitation]

Dr Munir Munshey
Alif, Laam, Ra. These are the verses of the book, a clear lucid Qur´an

Edward Henry Palmer
Those are the signs of the Book and of a perspicuous Qur'an

Farook Malik
Alif L'am Ra. These are the verses of the Divine Book, the Glorious Qur’an which makes the things clear

George Sale
These are the signs of the book, and of the perspicuous Koran

Maududi
Alif. Lam. Ra´. These are the verses of the Book, and a Clear Qur´an