“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.
Social Sciences67Computer Science30Arts and Humanities13Language and Literature: Philology. Linguistics: Communication. Mass media1Science: Mathematics: Instruments and machines: Electronic computers. Computer science1