ひとしずく×やま△ (Romaji: Hitoshizuku and Yamasankakkei, Hitoshizuku and Yama san kakkei, Hitoshizuku x Yama△ Also known as: Yamashizuku, やましずく) is a Japanese Vocaloid producer duo. The main Vocaloid voicebanks they use are Kagamine Len and Kagamine Rin. However, they do use voicebanks of other Vocaloids too. This duo is also part of teamOS a content creating circle consisting of composers, lyricists, illustrators, video makers (also known as PV makers/Promotional Video makers) and video editors.