agate The baseball. The term may have derived from “marble,” another name for the ball. Agates or aggies were popular forms of marbles. 1st use. 1913 (The Sporting News, Oct. 30; Peter Morris). – Paul Dickson, The Dickson Baseball Dictionary, 3rd ed.
agate ag-ate \á-gət\ n. 3.a. A size of type approximately 5 ½ point. 3.b. Condensed information (such as advertisements or box scores) set especially in agate type. – Merriam Webster Dictionary
“An agate font is commonly used to display statistical data or legal notices in newspapers.” – Wikipedia
agate type “The phrase ‘agate type’…is still used to describe the tiny text of baseball box scores or classified ads…” – Walker Rumble, The Swifts: Printers in the Age of Typesetting Races
Negro league 1. A general, legacy term for professional baseball played by all-Black teams and leagues during the era of segregation. In its expansive sense, the term is not limited to league clubs or players, or to league games played by these clubs. 2. More specifically, all-Black baseball leagues during the same era. Does not include the national leagues of Latin American countries (e.g. Cuba, Dominican Republic, Mexico), although Black players did participate in those leagues.
Negro leaguers Players and officials for Negro league clubs and leagues.