Abstract: Devices, apparatus, and methods for clamping a pivoting arm/flag onto an edge of furniture, such as a table edge, countertop edge, and the like, with or without messages and advertising indicia thereon, in order to signal servers and wait staff that service is being requested. The clamp can include a one-piece clip with a substantially horizontal top leg perpendicular to a top edge of a back panel, and an upwardly angled lower leg attached to a bottom edge of the back panel.