B2O3 is called boric oxide because it's a compound formed by the combination of boron (B) and oxygen (O).

Here's the breakdown:

* Boron is the element with the symbol B.

* Oxygen is the element with the symbol O.

* Oxide is a general term for a compound containing oxygen, specifically in the form of an anion (negatively charged ion).

In the case of B2O3, boron has a +3 oxidation state and oxygen has a -2 oxidation state. This leads to the formation of a compound with two boron atoms and three oxygen atoms, hence the formula B2O3.

Therefore, the name boric oxide accurately reflects the composition of the compound: boron and oxygen forming an oxide.