Government Accounting Office, GAO, United States Government Accounting Office(noun)

an independent nonpartisan federal agency that acts as the investigative arm of Congress making the executive branch accountable to Congress and the government accountable to citizens of the United States

Gao

Karveh or Karvah, a Persian blacksmith, whose sons had been slain to feed the serpents of the reigning tyrant, raised his leather apron on a spear, and with that for a standard excited a revolt; the revolt proved successful, and the apron became the standard of the new dynasty, which it continued to be till supplanted by the crescent.