end cap

Short definition from Wiktionary

Noun

1. 1
   A display of goods for sale situated at an end of an aisle in a shop, perpendicular to the goods in the aisle.
2. 2
   Any of various capping devices that fit over the end of something, either as protection or to prevent loss of contents.
3. 3
   Any of various capping devices that fit over the end of something, either as protection or to prevent loss of contents: A piece of packaging insulation that surrounds one side of an object.