A controlled receptacle is an ordinary-looking outlet that a control system can turn off. The signal is usually an occupancy sensor, a time schedule, or the lighting control system. A relay does the actual switching. The power symbol on the face is the mark that this outlet can shut itself off.
Many commercial energy codes, including recent ASHRAE 90.1 and IECC editions, ask for automatic shutoff on at least half of the standard 15- and 20-amp, 125-volt receptacles in rooms such as private offices, conference rooms, print and copy rooms, break rooms, classrooms, and individual workstations. The electrical code wants those controlled outlets marked.
Plug task lamps, monitors, and chargers into the controlled half. Keep refrigerators, servers, and anything that must stay on plugged into an uncontrolled outlet. The rule is not the same in every code edition, so confirm what is adopted for the building. Wiring belongs to a licensed electrician.