﴿ إِرَمَ ذَاتِ ٱلْعِمَادِ ﴾

“[the people of] Iram the many-pillared,”

Iram — these were the former people of ‘Ād Irama is an explicative supplement or a substitution and it is treated as a diptote because it is a proper noun and feminine — of the towering ones that is to say the tall ones — the tallest one among them would reach four hundred cubits —