BA.1

Etymology
From being being assigned when the second variant occurred, and then shortened. Pango notation does not officially support 4 sublevels, leading to a need to renumber "B.1.1.529.1", thus shortened to a new base "BA" for "B.1.1.529" and ".1" becoming "BA.1"

Proper noun

 * 1)    The first . A highly transmissible though milder variant of the , which causes ; first detected in 2021 in  and.