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After a new variant with the unwieldy scientific name of B.1.1.529 was discovered last week in South Africa, observers might have expected WHO to name it after the next Greek letter on the list: Nu.

The Greek alphabet will be replaced by a supplemental list of names using the same rules as the main Atlantic hurricane season naming list — a list of names A-Z but excluding the letters Q, U, X ...

According to the Greek alphabet, the World Health Organization was expected to name the latest Covid-19 variant “Nu” or “Xi.” But both names were seen as problematic.