Final answer:
The 10th day of Muharram is known as Ashura, a day of mourning and remembrance in the Islamic community, especially among Shia Muslims due to the martyrdom of Hussain ibn Ali at the Battle of Karbala.
Step-by-step explanation:
The 10th day of Muharram is known as Ashura. This is a significant day for Muslims, particularly for the Shia community as it marks the anniversary of the Battle of Karbala where Hussain ibn Ali, the grandson of the Prophet Muhammad, was martyred. The day is observed with mourning and reflection on the themes of sacrifice and resistance against injustice.
Ashura is surrounded by various traditions and is seen as a day of remembrance for the entire Muslim community. Though its observation differs between Sunni and Shia Muslims, it is universally recognized within Islam as a historical and spiritual day of importance.