Name a vestigial bony part of human skeleton.

Explanation

**Step-by-Step Solution:**

1. **Understanding Vestigial Structures**: Vestigial structures are parts of an organism that have lost most or all of their original function through the process of evolution. In humans, there are several vestigial organs, including bony parts of the skeleton.

2. **Identifying the Vestigial Bony Part**: Among the various vestigial structures in the human body, one notable bony part is the coccyx.

3. **Function in Ancestors**: The coccyx, commonly known as the tailbone, was once part of a tail in our ancestors. In many animals, tails serve important functions such as balance and locomotion.

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