Pair of intersecting lines

Definition
A pair of intersecting lines is the underlying topological space of any subset of Euclidean space (of dimension two or higher) that comprises two distinct and intersecting lines. An example is the set:

$$\{ (x,y) \in \R^2 \mid xy = 0 \}$$

This is the pair of the $$x$$-axis and the $$y$$-axis in $$\R^2$$.