A black Islamic flag on a Canada Day celebration was found floating around on social media today on the day Canada celebrates their 150th birthday.
The black flag is usually known to be used by jihadist groups such as ISIS and Taliban.
The Pashtun tradition of using a black flag with a white shahada (Islamic creed) inscription as a military ensign, harking back to the 18th-century Hotak dynasty, was adopted by the Taliban, and thence by Al-Qaeda in the 1990s. This usage was adopted by the global jihadism movement in the early 2000s, and in the 2010s by the Islamic State of Iraq and the Levant. (Wikipedia)
The flag appears to be Islamic but the symbol the flag represents is unknown at this time.