“Koma” is a kind of spinning top toy. A spinning top is a popular play around the world and “Koma” playing is considered an auspicious activity in Japan. An axle attached to a circular and thick material is rotated by the motion of throwing with a string. If you use the right hand, the rotation mode will be clockwise. When using the left hand, the rotation mode is counterclockwise. The clockwise spinning top and the counterclockwise spinning top correspond to mirror images, and these enantiomers can be created separately via enantioselective synthesis. More information can be found in the Communication by Kenya Nakata, Isamu Shiina et al.

中文翻译：

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外消旋2-羟基芳基酮通过不对称酯化的动力学拆分：研究共碱对选择性的影响

“ Koma”是一种旋转陀螺玩具。旋转陀螺在世界范围内都很流行，在日本，“ Koma”演奏被认为是吉祥活动。附在圆形和厚实材料上的轴通过用绳子投掷的运动而旋转。如果使用右手，则旋转模式为顺时针。使用左手时，旋转模式为逆时针。顺时针旋转陀螺和逆时针旋转陀螺对应于镜像，并且这些对映异构体可以通过对映选择性合成分别生成。有关更多信息，请参见《肯尼亚中田大学通讯》（Isamu Shiina等）。