A Cleat

1. A strip of wood or iron fastened on transversely to something in order to give strength, prevent warping, hold position, etc.
2. A continuous metal strip, or angled piece, used to secure metal components.
3. (nautical) A device to quickly affix a line or rope, and from which it is also easy to release.

4. A protrusion on the bottom of a shoe meant for better traction