What is warhammer 50k?

I'm sorry, but there is no such thing as "Warhammer 50k". The Warhammer franchise includes several tabletop games, video games, and a vast fictional universe, but the highest number used in the naming convention is "Warhammer 40,000" (or simply "40k"). This game is set in a dystopian future where humanity controls a vast territory spanning thousands of worlds, but is constantly threatened by aliens, daemons, and internal strife. Players command armies of miniatures representing various factions and engage in strategic battles using dice, rulers, and complex rules. The game has a loyal following and is known for its rich lore, intricate miniature models, and competitive gameplay.