The Omicron variant is a variant of SARS-CoV-2, the virus that causes COVID-19. It was first reported to the World Health Organization (WHO) from South Africa on 24 November 2021. On 26 November 2021, the WHO designated it as a variant of concern and named it "Omicron", the fifteenth letter in the Greek alphabet. https://en.wikipedia.org/wiki/SARS-CoV-2_Omicron_variant
- who have been "Nu", but WHO was heading off the next one being "Xi"