A cubic unit is a unit for measuring volume. Each face of a cubic unit is a square, and each edge is one unit in length. Refer to the image below for reference.
In the metric system, commonly used cubic units include cm3 (cubic centimeter), dm3 (cubic decimeter), and m3 (cubic meter).
U.S. customary system
In the U.S. customary system, commonly used cubic units include in3 (cubic inch), ft3 (cubic foot), and yd3 (cubic yard).