turn and slip indicator
/ˈtɜːn and ˈslɪp ˈɪndɪkˌeɪtə/
n
English · turn and slip indicator中文 · 转弯侧滑仪Español · indicador de viraje y de inclinaciónFrançais · indicateur de virage et d’inclinaison latérale
意味：Instrument with a gyroscope connected to a pointer that indicates the rate and direction of turning; it also has a ball that shows if the glider is rolling sideways.