Nun. By the pen and what they inscribe, (68:1)

Almuntakhab Fi Tafsir Alquran Alkarim

(Nun, and by what it represents and what it stands for as a natural symbol of adoration), and the pen -employed in writing with a pen- and by the pen -the instrument of authorship-, (and by what they commit in writing)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(68:1) Nun. By the pen and what the scribes write. *1

Nun. By the pen and what they inscribe, meaning

*1) The great commentator Mujahid says that by pen here is meant the Pen with which the Qur'an was being written down. From this it automatically follows that that which was being written implies the Holy Qur'an itself.
 

Nun. By the pen and what they inscribe, meaning in Urdu

ن، قسم ہے قلم کی اور اُس چیز کی جسے لکھنے والے لکھ رہے ہیں