Now the original Eth1 blockchain will be called the “execution layer”, and the new PoS blockchain will be called the “consensus layer”.
The long-awaited transition Ethereum from PoW to PoS is expected to take place in the second or third quarter of this year.
On January 24, the Ethereum Foundation blog published entry:
One of the main problems with the name “Eth2” is the broken understanding of this concept by new Ethereum users. They intuitively think that first there will be Eth1, and then Eth2 will appear, and that with the appearance of Eth2, Eth1 will cease to exist. But that's not true. By removing the term “Eth2,” we are helping all of our future users understand the complex system more easily.
Additionally:
Criminals often try to use the confusion with Eth2 to deceive users. They offer to “convert” their ETH to Eth2 or offer to move to a new network without waiting for an update.
Under the new terminology, the combination of the execution layer (Eth1) and the consensus layer (Eth2) will be referred to as Ethereum, and individual functions such as merging and shared chains will now be called “updates.”

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According to cointelegraph.com
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