book-end

Noun

bookend (plural bookends)

1. A heavy object or moveable support placed at one or both ends of a row of books for the purpose of keeping them upright.

   Synonyms:

   book support

2. (figuratively) Something that comes before, after, or at both sides of something else.
   • The cabinet minister's appearance served as something of a bookend to her grilling by the Home Affairs select committee in April this year[…]2012 November 1, Kelly Fiveash, “Snooper's-charter plans are just misunderstood, sniffles tearful May”, in The Register

See all 3 meanings of bookend