Here's how to break it down:

* Be represents the element beryllium.

* PO4 represents the phosphate ion (PO4^3-).

* 3 indicates that there are three beryllium ions (Be^2+) in the compound.

* 2 indicates that there are two phosphate ions (PO4^3-) in the compound.

To form a neutral compound, the positive charges from the beryllium ions must balance out the negative charges from the phosphate ions. This results in the formula Be3(PO4)2.