Abstract: A shelf sign system comprising a first shelf and a second shelf, a first mounting bracket attached to the first shelf and attached to the second shelf, the first mounting bracket spanning the first shelf and the second shelf, and a rotatable sign unit engaged with the mounting bracket. The sign unit is slidably engaged with the first mounting bracket permitting lateral movement of the sign unit. The mounting bracket may include a first flange with a first flange opening and a second flange with a second flange opening and a pin rotatably disposed in the first flange opening and the second flange opening, wherein the sign unit is engaged with the pin. The sign unit may include an L-shaped pivot bracket slidably engaging the pin. The sign unit may be rotatable from a first closed to a second open position. Also, a pivot bracket may be vertically slidable along the pin when the sign unit is in the open position so that the sign unit rests against the first and second flange.