# Line (geometry)

In geometry, a line is an infinitely long object with no width, depth, or curvature. Thus, lines are one-dimensional objects, though they may exist embedded in two, three, or higher dimension spaces. The word line may also refer to a line segment in everyday life, which has two points to denote its ends (endpoints). A line can be referred to by two points that lie on it (e.g. ${\textstyle {\overleftrightarrow {AB}}}$) or by a single letter (e.g. ${\displaystyle \ell }$).