I searched the acronym but it apparently stands for all sorts of phrases. Here's the context:
Imāmīs also claim that the Sunnīs omitted or suppressed Sūrat al-Nūrayn, “The Two Lights”; cf. Ar. text and trans. in Nöldeke, GQ, ii, 102-7) as well as other passages that testify to 'Alī’s distinct role as Muhammad’s spiritual and political heir.