endcap

noun

1. A cap placed on the end of something.
2. A product display at the end of a supermarket aisle

   “Another endcap featured Breakout books under a sign that read “Hand-Picked Titles From Emerging Authors” and showed a picture of a small chick pecking its way out of a broken eggshell.”

3. A logo or visual sequence immediately following a programme, identifying the broadcaster or production company.

verb

1. To add an endcap to.
2. To modify a reactive end of a polymer, typically by adding a trimethylsilyl group to a hydroxyl.