Manufacturer identifier
Manufacturer identifier means the first three digits of a VIN of a vehicle manufactured by a high-volume manufacturer, and the first three digits of a VIN and the twelfth through fourteenth digits of a VIN of a vehicle manufactured by a low-volume manufacturer.
Source
49 CFR § 565.12
Scoping language
Federal Motor Vehicle Safety Standards Definitions. Unless otherwise indicated, all terms used in this part that are defined in 49 CFR 571.3 are used as defined in 49 CFR 571.3.