Rocker

noun

1. A curved piece of wood attached to the bottom of a rocking chair or cradle that enables it to rock back and forth.
2. A rocking chair.
3. The lengthwise curvature of a surfboard. (More rocker is a more curved board.)

   "All modern surfboards share a similar rocker design — Bruce Jones https//web.archive.org/web/20051212041317/http://www.brucejones.com/longboar.htm"

4. The breve below as in ḫ.
5. Someone passionate about rock music.