Read about it here,
https://blogs.nvidia.com/blog/2021/05/18/lhr/Basically it stands for Lite Hashrate and its Nvidia's attempt to make the gamers happy and make the GPUs less desireable to miners so gamers can get their hands on them. Many think why does Nvidia care whether Gamers or Miners buy their GPUS, they get their money anyways? But the issue is that for the past year or so many gamers are mad because GPUs are OOS everywhere and they are forced to pay huge markups.
So these GPUs will be easier to find in stock usually. You can even mine with them but the hashrate is reduced. Wonder if AMD will make a similar approach?
Amd has come out already and said they won't purposely reduce the hashrate of their cards.