"TT" is a song recorded by South Korean girl group Twice. The song was released by JYP Entertainment on October 24, 2016, as the lead single from their third extended play Twicecoaster: Lane 1. It was written and composed by Sam Lewis and Black Eyed Pilseung respectively. The title "TT" refers to an emoticon used to express crying or sadness.[2] The Japanese version of "TT" was released as the lead single from the group's first Japanese compilation album, #Twice.[3] Its accompanying music video was released on June 21, 2017.