In the United States, owned-and-operated television stations (frequently abbreviated as O&Os) constitute only a portion of their parent television networks' station bodies, due to ownership limits imposed by the Federal Communications Commission (FCC). Currently, the total number of television stations owned by any company (including a television network) can only reach a maximum of 39% of all U.S. households;[1] in the past, the ownership limit was much lower, and was determined by a specific number of television stations rather than basing the limits on total market coverage.