201120

201120 is a four-digit number that has gained attention primarily due to its association with the Japanese dating system, known as *nensei* (年誕), which combines the year of birth and the month of birth. In this system, the number represents the year 2011 and the month of December (12), making it a shorthand for someone born in December 2011.

The term became particularly notable in 2023 when it was widely used in Japan to refer to individuals born in December of that year, as the Japanese fiscal year begins on April 1. This led to a cultural phenomenon where people born in December 2011 were often addressed as "201120" in online communities, social media, and discussions about age-related milestones. The number was frequently used in memes, hashtags, and celebratory posts as these individuals turned one year older in April 2023, marking their transition into a new age category.

While the term is not widely recognized outside Japan, its popularity reflects broader trends in how digital and social media influence cultural expressions. The use of "201120" highlights how numerical shorthand can simplify communication, particularly in contexts where traditional age calculations differ from Western standards. The phenomenon also sparked conversations about generational identity and the role of technology in shaping cultural narratives.