indicador para viraje en nado de espalda
/ˌindikaðˈoɾ pˌaɾa βiɾˈaxe en ˈnaðo ðe espˈalða/
n
English: backstroke turn indicator · 仰泳转身标志绳
Significado：Rope with pennants that is strung 5 m from the finish and turning walls; backstroke swimmers use it to judge distance.