Genesis 10 is often called the "Table of Nations" because it outlines the descendants of Noah's sons (Shem, Ham, and Japheth) and how these descendants populated the earth after the Great Flood. In this context, Genesis 10:7 is a genealogical statement, tracing the lineage of a specific branch of Noah's family:

Cush was one of the sons of Ham (Genesis 10:6).
The verse lists the sons of Cush: Seba, Havilah, Sabtah, Raamah, and Sabteca.
Raamah was one of the sons of Cush, and the verse then lists Raamah's sons: Sheba and Dedan.

In essence, the verse provides a family tree, showing the relationships between these individuals.

Symbolic and Historical Interpretations:

While the verse is primarily a genealogical record, there are often attempts to link these names to specific geographical locations and peoples:

Seba, Havilah, Sabtah, Sabteca, Sheba, and Dedan: These names are often associated with regions and peoples in ancient Africa and Arabia. Identifying precise modern-day equivalents is difficult and subject to scholarly debate, but generally, they are thought to be in areas of Ethiopia, Sudan, and the Arabian Peninsula.
Cush: Is typically linked to the ancient kingdom of Cush, located in present-day Sudan.

Significance:

Tracing Ancestry: The verse helps to establish a connection between different groups of people and their common ancestor (in this case, Noah through Ham and Cush).
Population Distribution: The Table of Nations aims to provide a framework for understanding how the post-flood world was populated by the descendants of Noah's sons.
Foundation for Later Narratives: Knowing the ancestral relationships can be helpful in understanding subsequent biblical narratives involving these groups.

In short, Genesis 10:7 is a genealogical verse that details the descendants of Cush, highlighting their familial relationships and potentially hinting at their geographical locations.