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gEfiConsoleOutDeviceGuid

Guid specify the device is the console out device.
Include/Guid/ConsoleOutDevice.h

GUID Information

GUID's Guid NameGUID's Guid
gEfiConsoleOutDeviceGuid{ 0xD3B36F2C, 0xD551, 0x11D4, { 0x9A, 0x46, 0x00, 0x90, 0x27, 0x3F, 0xC1, 0x4D }}

Refer to Header File

MdeModulePkg/Include/Guid/ConsoleOutDevice.h