What is isis knot?

Answer 1

"We do not know the exactly the origin of the Isis knot, which seems to illustrate a knotted piece of cloth, though initially its hieroglyphic sign was perhaps a variant of the ankh. This rather enigmatic symbol closely resembles the ankh, except that its transverse arms are curved downward. Even in written sources the meaning and symbolism of this object, known as the tyet (tiet, thet) by the the ancient Egyptians, seems to be similar to those of the ankh, and the sign is often translated as "life" or "welfare." In representational contexts, the tyet is found as a decorative symbol as early as the 3rd Dynasty, when it appears with both the ankh and the djed signs, and later with the was scepter. However, the symbol itself is much, much older, appearing at least as early as the Predynastic Period."

- Jimmy Dunn (see link)

answer 2: Western power structure create all terrorist group like Al Qaeda, Taliban and now Takfiries and Isis and they make lots of films and advertisment against Islam because they want to increase Islamophobia. Islamophobia (or anti-Muslim sentiment) is a term for prejudice against,hatred towards, or fear of the religion of Islam or Muslims.The term entered into common English usage in 1997 with the publication of a report by the Runnymede Trust condemning negative emotions such as fear, hatred, and dread directed at Islam or Muslims. While the term is now widely used, both the term itself and the underlying concept have been criticized.The causes and characteristics of Islamophobia are still debated.Some scholars have defined it as a type of racism. Some commentators have posited an increase in Islamophobia resulting from the September 11 attacks, while others have associated it with the increased presence of Muslims in secular nations