What is "al-qalam"

Sūrat al-Qalam (, “The Pen”) is the sixty-eighth sura of the Qur'an with 52 ayat. The Surat describes Allah's justice and the judgment day. Three important themes of this Surah are response to the opponents objections, warning and admonition to the disbelievers, and exhortation of patience to the Islamic prophet Muhammad. Chronologically, this is the first appearance of any of the "disjointed" [i.e., single] letters ( muqattaat) which precede a number of the surahs of the Qur'an while in Quranic Order this is the last surah to have the appearance of ( muqattaat).