This is the parameter's key name — the label identifying which specific setting this Param row's Value field is holding. Each ChassisFeature can carry several tunable settings as separate key/value ChassisParam children — e.g. the wattage ceiling under a power-cap feature — so this is where the actual configured number, not just the feature's name, lives. On this kind of record the name is typically something like 'wattage-limit', so pairing it with the sibling Value attribute tells you which setting is at which number without needing a separate lookup table.