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gEfiConsoleInDeviceGuid

Guid specify the device is the console in device.
Include/Guid/ConsoleInDevice.h

GUID Information

GUID's Guid NameGUID's Guid
gEfiConsoleInDeviceGuid{ 0xD3B36F2B, 0xD551, 0x11D4, { 0x9A, 0x46, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D }}

Refer to Header File

MdeModulePkg/Include/Guid/ConsoleInDevice.h