Delta calling July 21, 2021 Ancient Greek alphabets, alpha, beta, gamma, delta…. are once again being used widely worldwide – this time recommended by the World Health Organization (WHO) to refer to different variants of Covid-19 for non-scientific purposes. This recommendation is based on three reasons. First, Greek alphabets are easy to pronounce and remember. Second, an alphabetic sequence can reveal the order in which the variants were discovered. And third, the alphabets are non-stigmatizing. Scientists and scientific research follow the nomenclature systems established by GSAID, Nextstrain, and Pango – B 1 1 7 for alpha or the British variant, and B 1 6 1 7 2 for the Delta or Indian variant.