In how many points can two different lines at the most intersect?

If $A, B, C$ are three collinear points, name all the line segments determined by them.

A line segment has no definite length.

A ray has no endpoint.

A line has a definite length.

A line $\overleftrightarrow{AB}$ is the same as line $\overleftrightarrow{BA}$.

Two distinct points always determine a unique line.

Three lines are concurrent if they have a common point.