How many perpendicular lines has a cuboid got?

A cuboid has 12 edges, and each edge is perpendicular to 4 other edges. Thus, in total, there are 12 pairs of edges that are perpendicular to each other. However, if considering distinct perpendicular lines, a cuboid effectively has 3 sets of three mutually perpendicular lines, corresponding to its three dimensions (length, width, and height).