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$Less Than:Greater Than: <> $

The boundary values in strict inequalities are $Less Than or Equal To:Greater Than or Equal To: ≤≥ $

The boundary values in non-strict inequalities
It can be seen that in order to indicate strict inequalities graphically, an open point $(∘)$ is used for number line inequalities and a dashed boundary line or curve is used for two-dimensional inequalities. To indicate non-strict inequalities graphically, a closed point $(∙)$ is used for number line inequalities and a solid boundary line or curve is used for two-dimensional inequalities.