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

Part Number:TPS61230A

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