SPIKE

noun

1. In a violin-family instrument, the carved wooden plug which sits in the bottom block of the instrument.

noun

1. The spike of a cello or double bass that makes contact with the floor and supports the weight of the instrument.

noun

1. A sort of very large nail.
2. A piece of pointed metal etc. set with points upward or outward.
3. Anything resembling such a nail in shape.