Core Viewpoint - The article discusses the cultural significance and evolution of using parentheses in online communication, particularly within the "二次元" (anime and manga) community, highlighting how this practice has become a symbol of identity among younger internet users [4][60]. Group 1: Origin and Evolution - The use of parentheses in communication is traced back to its origins in written language, where it served to provide annotations and context [15][16]. - In early Japanese internet culture, parentheses were used to capture emotions and reactions in written records, which later transitioned into online expressions [18][20]. - The practice of adding parentheses has evolved from a niche usage in the 二次元 community to a broader application among younger internet users, reflecting a shift in communication styles [60][61]. Group 2: Cultural Significance - The addition of parentheses has become a marker of "二次元浓度" (degree of involvement in the 二次元 culture), serving as a subtle indicator of one's cultural identity [5][9]. - The phenomenon of using parentheses has been embraced by various online communities, including "语C" (language cosplay), where participants enhance their character portrayals through detailed descriptions [41][44]. - As the 二次元 culture integrates into mainstream society, the use of parentheses has transformed from a niche habit to a widely recognized form of expression among young people [60][61]. Group 3: Functional Uses - Parentheses serve multiple functions in communication, such as softening statements, expressing uncertainty, or adding humor, thereby enriching the conversational context [55][57][59]. - The practice allows users to convey complex emotions or thoughts succinctly, often creating a playful or ironic tone in their messages [58][60]. - The evolution of parentheses usage reflects a broader trend in online communication, where brevity and expressiveness are increasingly valued [54][61].