س ر د قs-r-d-q
(quadriliteral, rubāʿī) — سُرَادِقٌsurādiq pl. سُرَادِقَاتٌsurādiqāt (noun, ism dhāt): the large canopy or canvas enclosure set up around a tent; most of the lexicographers hold it to be of Persian origin, from معرّبmuʿarrab («sarāpardah»). In the Quran it occurs in describing the enclosure of Hell. ﴿اِنَّآ اَعْتَدْنَا لِلظّٰلِمِيْنَ نَارًا اَحَاطَ بِهِمْ سُرَادِقُهَا﴾ (Al-Kahf 18:29)Only once in the Quran.