A type of "auspicious symbol". Several knots tied together; the complexity of the knot can vary, and it has a multitude of meanings.
Also known as the infinity knot. In Hinduism, it's called the Shrivatsa.
It is an important symbol in Hinduism, Jainism and Buddhism. It's also an important cultural marker in places influenced by Tibetan Buddhism, such as Tibet, Mongolia, Tuva, Kalmykia, and Buryatia. It is also found in Celtic, Kazakh and Chinese symbolism.
The knotted version is called the panchang knot; or the chrysanthemum knot by Koreans.