I learned this before, so you'll get the hang of it! The closed circle symbolizes one of these symbols ( > or < ) with a line under them, like what is shown in the problem. A line to left is greater than, and a line to the right is less than. For example, 6 is greater than the variable A, so the letter A(Variable) would be any of the numbers to the left. The open circle is these symbols (> or <) without a line under them.
