What is the name of the PO4^3- ion?

The ion PO₄^3- is known as phosphate.

Phosphate is a polyatomic ion that consists of one phosphorus atom surrounded by four oxygen atoms. It carries a negative charge of three, which is why it is designated as PO₄^3-. Phosphate plays a crucial role in biological systems, being a key component of DNA, RNA, and ATP (adenosine triphosphate), which is essential for energy transfer in cells.