gEfiSecureBootEnableDisableGuid

GUID used to "SecureBootEnable" variable for the Secure Boot feature enable/disable.
This variable is used for allowing a physically present user to disable Secure Boot via firmware setup without the possession of PKpriv.
Include/Guid/AuthenticatedVariableFormat.h

GUID Information

GUID's Guid Name	GUID's Guid
gEfiSecureBootEnableDisableGuid	{ 0xf0a30bc7, 0xaf08, 0x4556, { 0x99, 0xc4, 0x0, 0x10, 0x9, 0xc9, 0x3a, 0x44 } }

Refer to Header File

SecurityPkg/Include/Guid/AuthenticatedVariableFormat.h