Very good question.
The "head" in this phrase refers to the head tag of an HTML document.
For example, a simple HTML document may look like this:
<!-- This area is accessible by the HTML <head> editor feature -->
<!-- Scripts and stylesheets might go here -->
<p>This is my HTML document.</p>
The HTML Head Editor feature allows users to insert their own custom code inside of the
Please let me know if you have questions about this information, or if you need additional clarification.