tailpiece

noun

1. An appendage or appendix.
2. An element, often triangular, to which the strings of a violin, guitar, etc. are attached at the lower end of an instrument.
3. A short joist between a header and a wall.
4. The part of a telescope containing the adjusting device for the eyepiece, etc.
5. The part of a lock that transmits motion from the hub to the latch bolt.
6. An ornamental design at the end of a chapter or page.