This is the PCI vendor ID of the user's graphics card. This number uniquely identifies a
particular graphics card maker. The number is the same across operating systems and driver versions.
Note that device IDs are only implemented on PC (Windows/Mac/Linux) platforms and Android when running Vulkan; on other platforms you'll have to do name-based detection if needed.
See pci-ids.ucw.cz for a list of vendor IDs.
See Also: SystemInfo.graphicsDeviceID, SystemInfo.graphicsDeviceVendor.