OS-tan

OS-tan is a fun and exciting Internet meme that consists of moe anthropomorphs of popular operating systems. The designs of OS-tan are typically female, and the personifications of Microsoft Windows operating systems are often depicted as sisters of varying ages. The -tan element in the term is a hypocoristic suffix in Japanese that implies extremely youthful endearment. Though initially appearing only in fan works, the OS-tan proved popular enough that Microsoft branches in Singapore and Taiwan used the OS-tan concept as the basis for ad campaigns for Internet Explorer and Microsoft Silverlight, respectively.