Greek letter used for a 2021 Covid variant NYT crossword answer is:
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The Greek letter used for the 2021 Covid variant Crossword Clue NYT (March 14 2023) is "omega". This is due to the fact that the variant was first identified in the United Kingdom in December 2020 and is the last of the variants to be identified in the UK. It is believed to be more contagious than other variants and has been linked to a number of outbreaks in the UK and other countries.