What does GABR stand for? 

Gabr

Gabr is a New Persian term originally used to denote a Zoroastrian. Historically, gabr was a technical term synonymous with mōg, "magus", denoting a follower of Zoroastrianism, and it is with this meaning that the term is attested in very early New Persian texts such as the Shahnameh. In time, gabr came to have a pejorative implication and was superseded in literature by the respectable Zardoshti, "Zoroastrian". By the 13th century the word had come to be applied to a follower of any religion other than Islam, and it has "also been used by the Muslim Kurds, Turks, and some other ethnic groups in modified forms to denote various religious communities other than Zoroastians, sometimes even in the sense of unbeliever." As a consequence of the curtailment of social rights, non-Muslims were compelled to live in restricted areas, which the Muslim populace referred to as Gabristans. In the Ottoman Empire, the Turkish version, giaur, was used to refer to Christians. This is sometimes still used today in former Ottoman territories and carries a strong pejorative meaning. The etymology of the term is uncertain.

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