This is the parameter's key name — the label identifying which specific setting this Param row's Value field is holding. It holds the actual tunable value behind an environmental capability — for example the wattage budget a power-rebalancing feature is allowed to shift between chassis — separately from the feature record's own name and type. On this kind of record the name is typically something like 'budget-watts', so pairing it with the sibling Value attribute tells you which setting is at which number without needing a separate lookup table.