structural:scholar_edition, structural:summarization
Toponymy

The name Islamabad means City of Islam. It is derived from two words: Islam and abad. Islam refers to the religion of Islam, Pakistan's state religion, and -abad is a Persian suffix meaning cultivated place, indicating an inhabited place or city. According to a history book by Muhammad Ismail Zabeeh, teacher and poet Qazi Abdur Rehman Amritsari proposed the name of the city.

Occasionally in writing, Islamabad is colloquially abbreviated ISB. Such usage originated in SMS language, in part due to the IATA location identifier for the Islamabad International Airport.