Final answer:
The 'body' in the given CSS rule is the selector, which specifies that the styling should be applied to the body element of an HTML document.
Step-by-step explanation:
In the given Cascading Style Sheets (CSS) rule, the selector is the part that identifies which HTML element the style should be applied to. In this case, the selector is body. The CSS rule is thus telling the web browser to apply the style (the property and value inside the curly braces) to the body element of the HTML document. The style here is setting the background-color of the body to a specific color code (#008080), which is a shade of teal.