In this task, you are given a question and a context passage. You have to answer the question based on the given passage.

What does the "O" in GESO stand for?, Context: Much of Yale University's staff, including most maintenance staff, dining hall employees, and administrative staff, are unionized. Clerical and technical employees are represented by Local 34 of UNITE HERE and service and maintenance workers by Local 35 of the same international. Together with the Graduate Employees and Students Organization (GESO), an unrecognized union of graduate employees, Locals 34 and 35 make up the Federation of Hospital and University Employees. Also included in FHUE are the dietary workers at Yale-New Haven Hospital, who are members of 1199 SEIU. In addition to these unions, officers of the Yale University Police Department are members of the Yale Police Benevolent Association, which affiliated in 2005 with the Connecticut Organization for Public Safety Employees. Finally, Yale security officers voted to join the International Union of Security, Police and Fire Professionals of America in fall 2010 after the National Labor Relations Board ruled they could not join AFSCME; the Yale administration contested the election.
Organization