Which of the following architectural elements terminates in arrows?

Dimension lines are architectural elements used in technical drawings to specify the measurements of a component or space within a design. They are typically depicted as thin lines with arrowheads at both ends, indicating the exact length that is being measured. These arrowheads are crucial, as they point to the boundaries of the dimension being represented, clarifying what the measurement refers to.

In contrast, other lines such as border lines establish the limits of the drawing area or frame, center lines denote the axes of symmetry or central points within a component, and reference lines serve as aids for locating elements but do not specifically indicate measurements with arrowheads. Thus, the distinctive use of arrowheads on dimension lines is what makes them the correct answer in this case.