Kagamine Rin & Len, codenamed CV02, are Japanese VOCALOIDs. When the Kagamines were being recorded in 2007, their names had not yet been decided. Their given names of Rin and Len were said to be based on "right" and "left", according to Asami Shimoda. She later confirmed in an interview after the Append release that the names were based on Ken and Rin from Hokuto no Ken, derived from a discussion about names that were familiar from her childhood. Their surname was derived from the developing code combining Kagami (鏡, mirror) and Ne (音, sound).