Here's a breakdown:

* Na: Represents the element sodium.

* 3: Indicates there are three sodium atoms in the molecule.

* P: Represents the element phosphorus.

* O4: Represents four oxygen atoms in the molecule.

Sodium phosphate is a common chemical used in a variety of applications, including:

* Food additive: It's used as a buffering agent, emulsifier, and water softener.

* Detergent: It's used as a builder in detergents to enhance cleaning power.

* Industrial applications: It's used in textile dyeing, water treatment, and the production of other chemicals.