* TEU (Twenty-foot Equivalent Unit): This is the basic unit of measure for containerized cargo. It represents a standard 20-foot long shipping container, regardless of its width or height. Even if a container is larger (like a 40-foot container), its capacity is still often measured in TEUs. A 40-foot container would be equivalent to 2 TEUs.
* FEU (Forty-foot Equivalent Unit): This refers to a standard 40-foot long shipping container. While often expressed as 2 TEUs, it's sometimes used independently to specify the number of 40-foot containers.
In essence, TEU is a standardized measure for comparing container capacity, while FEU specifically refers to the 40-foot container type. The TEU system allows for easy comparison of cargo volume across different container sizes.