Final answer:
A certificate of interest represents a member's ownership stake in an LLC, and is distinct from the operating agreement and articles of organization.
Step-by-step explanation:
A document that evidences a member's ownership interest in an LLC is referred to as a certificate of interest. This document is separate from the operating agreement, which outlines the LLC's operating procedures and the articles of organization that formally create the LLC with the state. The certificate of interest specifically represents the holder's ownership stake, similar to a stock certificate in a corporation.