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a. An all-inclusive term used in place of the following: appurtenance, sample, assembly, component, equipment, material, module, part, structure, subassembly, subsystem, system, unit, support system, documented concepts, or data.

b. When used in reference to nuclear material, a visible, single piece or container of nuclear material with a unique identification and known nuclear material mass.

An all-inclusive term used in place of appurtenance, assembly, component, equipment, material, module, part, structure, product, software, subassembly, subsystem, system, unit, or support systems. (10 C.F.R. § 830.3)

An all-inclusive term used in place of any of the following: appurtenance, assembly, component, equipment, material, module, part, structure, facility, subassembly, system, subsystem, or unit.