Why this name? Because you can see in one of the photos that in the first version the sleeve had a bias (some types of cotton or linen may get bias if worked in stockinette in the round and the diameter is very small). Then I came upon a solution and there is no bias any more. If you care, I wrote here more.
Otherwise, it is a basic sweater, very handy in Estonian Summer.

First 2 photos by Kristiina.