How the event is mourned differs between different branches of Shia and different ethnic groups. The event is also observed by many Sunnis, but to a lesser extent, and as a time of remembrance, rather than mourning.

In the Twelver three traditional schools (Usooli, Akhbari, and Shaykhi), mourners, both male and female, congregate (in separate sections) for sorrowful, poetic recitations performed in memory of the death of Husayn, lamenting and grieving to the tune of beating drums and chants of "Ya Husayn." Passion plays are also performed, reenacting the Battle of Karbala and the suffering and death of Husayn at the hands of Yazid. They offer condolences to Imam-e-Zamana also known as Imam al-Mahdi whom they believe will avenge the blood of Husayn and bring justice to the world

The Arabic term matam refers in general to any act or gesture of mourning; in Shia Islam the term designates acts of lamentation for the martyrs of Karbala. Many of the male and female participants congregate in public for ceremonial chest beating (matam) as a display of their devotion to Imam Husayn and in remembrance of his suffering. In some Shi'a societies, such as those in Bahrain, Pakistan, India, Afghanistan and Iraq, some male participants incorporate knives or razors swung upon chains into their matam. There are two basic forms of matam:

matam using one's hands only, that is, sineh-zani or breast-beating
matam with implements like chains, knives, swords and blades, that is, zanjeer-zani, qama-zani, etc.

Matam in South Asia is the most significant and sensitive Shia identity marker.

Source:Wikipedia

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