ح ق فḥ-q-f
— حِقْفḥiqf pl. اَحْقَافaḥqāf: a long dune of sand that has been bent and curved by the wind; the original sense is that of crookedness. al-Aḥqāf is the name of the region of the people of ʿĀd, and the surah takes its name from it. Only once in the Quran: ﴿وَاذْكُرْ اَخَا عَادٍ اِذْ اَنْذَرَ قَوْمَهُۥ بِالْاَحْقَافِ﴾ (Al-Aḥqāf 46:21)