Here's how we arrive at that name:

* Prefixes: We use prefixes to indicate the number of atoms of each element in the compound.

* Di- indicates two nitrogen atoms (N₂).

* Tri- indicates three phosphorus atoms (P₃).

* Element Names: The second element in the compound is named as if it were an anion, ending in "-ide".

Therefore, the name is dinitrogen triphosphide.