﴿ وَلَقَد تَّرَكْنَٰهَآ ءَايَةًۭ فَهَلْ مِن مُّدَّكِرٍۢ ﴾

“And, indeed, We have caused such [floating vessels] to remain forever a sign [of Our grace unto man]: who, then, is willing to take it to heart?”

ذَاتِ أَلْوَاحٍ وَدُسُرٍ‌ (to board that [ ship ] which had planks and nails...54:13). The word alwah is the plural of lawh and it refers to a board or a plank. The word dusur is the plural of disar and it stands for nail. It also means a cord of fibres of the palm tree with which the planks of a ship are bound together.