that the skip of the "N/v" (Nu) was so that the variant name wouldn't be phonetically the same as the word "new" and the "Ξ/ξ" (Xi) was done to obviously avoid politicizing the virus by inadvertently naming for a region (or in this case, a person, and in this case China since the PM is Xi).
This is actually the first time that W.H.O. is using this system of Greek letter designations (which is also what the NWS uses for tropical cyclones once they run out of regular names).
WHO announces simple, easy-to-say labels for SARS-CoV-2 Variants of Interest and Concern
31 May 2021 Departmental news Reading time: Less than a minute (198 words)
WHO has assigned simple, easy to say and remember labels for key variants of SARS-CoV-2, the virus that causes COVID-19, using letters of the Greek alphabet.
These labels were chosen after wide consultation and a review of many potential naming systems. WHO convened an expert group of partners from around the world to do so, including experts who are part of existing naming systems, nomenclature and virus taxonomic experts, researchers and national authorities.
WHO will assign labels for those variants that are designated as Variants of Interest or Variants of Concern by WHO. These will be posted on the
WHO website.
These labels do not replace existing scientific names (e.g. those assigned by GISAID, Nextstrain and Pango), which convey important scientific information and will continue to be used in research.
While they have their advantages, these scientific names can be difficult to say and recall, and are prone to misreporting. As a result, people often resort to calling variants by the places where they are detected, which is stigmatizing and discriminatory. To avoid this and to simplify public communications, WHO encourages national authorities, media outlets and others to adopt these new labels.
See the new labels
here.
https://www.who.int/news/item/31-05-2021-who-announces-simple-easy-to-say-labels-for-sars-cov-2-variants-of-interest-and-concern
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