Fully Diluted Shares
Fully diluted shares are the total number of outstanding shares if every potential means of conversion was exercised. Means of conversion refers to many things, like stock options and convertible notes.
Fully Diluted Shares selection at Investopedia
Fully-Diluted Capitalization at Clerkly's Legal Concepts for Founders
Fully Diluted Shares: Everything You Need to Know at Upcounsel
Mary Russell's Joining an Early Stage Startup? Negotiate Your Equity and Salary with Stock Option Option Counsel Tips at Stock Option Counsel
Sam Altman's Employee Equity at Sam Altman's blog