What is the name of the primordial noise at the end of the universe?

The primordial noise at the end of the universe is often referred to as "cosmic background radiation," specifically the cosmic microwave background (CMB) radiation. This faint afterglow of the Big Bang fills the universe and represents the thermal radiation from the early universe. As the universe evolves, this radiation cools and stretches, providing crucial insights into the universe's origins and structure.