A tail buoy is connected to the far end of the cable.

电缆的末端与一个尾随浮筒相连。

youdao

My guess is that if it is done right, collaborative filtering of content can expose the long tail better than the current cable bundle, at which point Apple (or some other company) would really have something to talk to the cable companies about.

FORBES: Tim Cook Again Expresses Intense Interest In TV Market, But Mutes The Real Issues

Also slightly cumbersome is the cable that trails the headset like a tail -- any demo that involved walking around required having an employee lift the cables and walk around as if you were wearing some Victorian bridal gown.

ENGADGET: Canon MREAL Mixed Reality headset hands-on (video)