What does the closed circle represent In inequality?

A closed dot represents a lreater than or equal to or less than or equal to, which can be distinguished in an inequaity's equation by an underline.

"Or equal to"

Step-by-step explanation:

The open circle is a basic greater than (>) and less than (<). The open one is the greater than or equal to (≥) and the less than or equal to (≤).