Sigma, the Dutch astrophysicist from Overwatch, became an instant meme sensation upon his 2019 release due to his tragic backstory and eccentric personality. The meme primarily centers around his ultimate ability voice line, 'What is that melody?', which is often used to describe sudden realizations or catchy music. Additionally, his name unintentionally aligned with the rising popularity of the 'Sigma Male' grindset trend, leading to countless crossover parodies where the gravity-controlling scientist is portrayed as the ultimate alpha. Whether it's poking fun at his lack of shoes or his chaotic mental state, Sigma remains a staple of the Overwatch community's humor and creative expression.