Kagamine Rin/Len

Kagamine Rin & Len (Japanese: 鏡音リン・レン), officially code-named CV02, are a pair of Vocaloid software voicebanks developed by Crypton Future Media, headquartered in Sapporo, Japan. Their official moe anthropomorphism consists of a pair of twin 14 year old singers, a boy and a girl, respectively named Len and Rin. They use Yamaha Corporation's Vocaloid 2 and Vocaloid 4 voice synthesizing technology. Their voices are samples of voice actress Asami Shimoda. They have performed at live concerts together, as they are each other's mirrors.

Their official code name, CV02, refers to their position as second Vocaloids made by Crypton Future Media for their "Character Vocal Series" (abbreviated "CV Series"), succeeding Hatsune Miku (code-named CV01) and preceding Megurine Luka (code-named CV03). Notice the number 02 on Rin's left shoulder in her official artwork.