“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.
Arts and Humanities49Social Sciences22Computer Science12Decision Sciences8Mathematics7History (General) and history of Europe: History (General)1Science: Mathematics: Instruments and machines: Electronic computers. Computer science: Computer software1