The word "" does not appear to be a standard Arabic military or religious term and may be a misspelling of Isma'ili (a branch of Shia Islam), or a specific localized name. Major Entities Known as "Army of Islam"

A Sunni insurgent group formed after the 2003 U.S. invasion, consisting largely of former Baathists.

To help with your research, here are standard Arabic terms related to your query:

Originally known as Liwa al-Islam (Brigade of Islam), this group was a prominent rebel coalition based in the Eastern Ghouta region near Damascus. It was founded by Zahran Alloush and was known for its disciplined structure and opposition to both the Syrian government and the Islamic State.

A military unit created in 1918 that operated in the Caucasus during World War I. Relevant Arabic Terms