backstroke turn indicator
/ˈbakstɹəʊk ˈtɜːn ˈɪndɪkˌeɪtə/
n
English · backstroke turn indicator中文 · 仰泳转身标志绳Español · indicador para viraje en nado de espaldaFrançais · repère de virage de dos
意味：Rope with pennants that is strung 5 m from the finish and turning walls; backstroke swimmers use it to judge distance.