Which feature indicates that a wall is constructed of solid bricks rather than a veneer?

The feature indicating that a wall is constructed of solid bricks rather than a veneer is when every seventh course of bricks is turned sideways. This specific construction technique is a hallmark of solid masonry walls, as it provides added structural stability and strength by interlocking the bricks in a way that enhances the wall's integrity. Turning bricks sideways allows for better bonding between courses, significantly reducing the likelihood of separation that can occur in a veneer wall, which typically does not have this level of interconnection.

In contrast, other choices do not specifically indicate solid brick construction. For instance, bricks laid in a running bond pattern are typical for both solid and veneer walls, as this is a common way to arrange bricks to ensure even distribution of weight. Mortar joints that are tuck-pointed can occur in any masonry wall type and serve both aesthetic and functional purposes without specifying the type of construction behind the wall. Finally, bricks that are flat-laid may also refer to a flat surface but do not sufficiently distinguish solid walls from veneers.