In response to the persecution of Christians and Yazidis by ISIL , an international social media campaign was launched to raise global awareness of the plight of religious minorities in Mosul , making use of the letter '' '' '' ( '' nun '' ) &mdash; the mark that ISIL troops spray painted on properties owned by Christians . Some Christians changed their profile pictures on Facebook and Twitter to pictures of the letter as a symbol of support . The letter , in relation to this social media campaign , is being called the " Mark of the Nazarene " from ( ; plural ) , a normative Arabic term disparagingly used by ISIL to brand Christians
persecution of Christians
Persecution of Christians by ISIL
Nun (letter)