top rail of sash
/ˈtɒp ˈɹeɪl ɒv ˈsaʃ/
n
English · top rail of sash中文 · 窗扇上冒头Español · travesaño superior de la vidrieraFrançais · traverse supérieure d’ouvrant
意味：Level piece of wood at the top of the movable part of the window.