During the 1980s, arcade games featured high score tables where game designers would hide signatures in place of direct credit for the games. By doing so, game designers could signal themselves to game players, and it became a subculture. The phenomenon largely took place during the Golden Age of Arcade Video Games, from 1980 to 1983, and became less common afterward due to the de-emphasis on high scores as a driving force in arcade games. The creators’ initials embedded in the games continue to provide ample mystery for those who play them, and a comprehensive list including names and roles can be found online.
https://thehistoryofhowweplay.wordpress.com/2023/05/14/arcade-authorship-high-score-table-credits/