How would describe this sentence?

The First Level.

A sentence fragement missing simple subject, Complete subject or complete predicate subject.

It's a fragment missing a predicate.

To describe the sentence "The First Level," we can first identify its components.

"The First Level" is a noun phrase, serving as the subject or object of a sentence. In this case, it appears to be a sentence fragment because it lacks a verb or predicate.

To understand the meaning or purpose of this sentence fragment, we would need additional context or information. It could potentially be a header or title for a section, a label for a concept or idea, or part of a larger sentence or paragraph. Without further context, it is difficult to analyze its purpose or function.