What is the term for the unsharpened top part of a knife blade?

The term for the unsharpened top part of a knife blade is the spine. The spine is the thick, rounded edge that runs from the handle to the tip of the blade, providing structural integrity and balance to the knife. It is an essential part of the knife's design, contributing to its sturdiness and ease of handling.

In contrast, the edge is the sharp part of the blade used for cutting; the handle is the part held while using the knife; and the heel refers to the rear section of the blade, typically used for tasks that require more force, such as chopping. Understanding the anatomy of a knife, including the function of the spine, is crucial for both novice and experienced chefs, as it aids in selecting the appropriate knife for specific tasks in the kitchen.