Particle physicists getting increasingly fancy with their quark terminology! The meme shows the evolution of quark naming conventions, from the pedestrian "up and down" (basic bear), to the slightly more sophisticated "top and bottom" (fancy suit bear), culminating in the absolutely dapper "strange and charm" (monocle-wearing aristocrat bear). It's the subatomic particle equivalent of watching someone upgrade from grocery store wine to aged single-malt scotch. The Standard Model doesn't just describe fundamental particles—it describes fundamental class.
For the curious: quarks come in six "flavors" (yes, that's the technical term), and physicists clearly had a blast naming them. The strange quark got its name because it seemed to decay more slowly than expected (how strange!), while the charm quark was named because it... well, charmed theorists by making certain equations work out beautifully. Science has never been so fashionable!