“2-yr mean citedness” is the OpenAlex field summary_stats.2yr_mean_citedness (CC0): mean citations per paper over a two-year window. It is a raw bibliometric field, not a journal rating, and is not used for default ranking.
Bibliography. Library science. Information resources1History (General) and history of Europe: History of Asia1Law: Asia and Eurasia, Africa, Pacific Area, and Antarctica: South Asia. Southeast Asia. East Asia1