Signs that are installed perpendicular to or at an angle to a building wall are called _____________.

The correct answer is 'Projecting signs' because these signs extend out from the building wall, usually at a right angle. This design allows them to be visible from a distance and enhances visibility for pedestrians and vehicular traffic. Projecting signs are typically utilized in situations where limited space is available for traditional wall-mounted signage or when greater visibility is needed.

Fascia signs, on the other hand, are attached flat against the surface of a building and do not extend outward, so they do not fit the description given in the question. Pole signs refer to elevated signs that stand independently from buildings, usually mounted on poles or similar structures, and thus are not mounted perpendicular to or at an angle to a building wall. Protesting signs are not a recognized category in signage terminology related to building codes and sign regulations. Therefore, 'Projecting signs' is the most accurate descriptor for signs installed at an angle to a building wall.