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TPS61230A: What does the HR stand for in the package name VQFN-HR?

Part Number: TPS61230A
Other Parts Discussed in Thread: TPS63070, TLV62585

VQFN-HR is found in a couple packages but I'm not able to find the meaning of "HR". It seems to be specific to TI and not an industry name. Does anyone know the meaning?

TPS61230A - Package Drawing RNS - Package Type VQFN-HR

TPS63070 - Package Drawing RNM - Package Type VQFN-HR

TLV62585 - Package Drawing RWT - Package Type VQFN-HR