PS/2 (Mini-DIN 6-pin) female to serial (DB9) female adapter.
Connection: It features a 6-pin Mini-DIN (PS/2) female port on one end and a 9-pin D-sub (DB9) female serial port on the other.
Use Case: It was commonly used with legacy computer mice or specific input devices to connect a PS/2-style connector into an older 9-pin serial port (COM port) on vintage PCs.