tailpiece

noun

1. An appendage or appendix.

2. musiclutherieAn element, often triangular, to which the strings of a violin, guitar, etc. are attached at the lower end of an instrument.

3. architectureA 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. Appendage added to extend the length of something