NOTE: Type F receptacles will also accept Type C and E plugs.
This is formally known as a "Schukostecker" plug, commonly abbreviated as "Schuko."

Where found:

Algeria, American Samoa, Aruba, Austria, Azores, Balearic Islands, Bosnia, Bulgaria, Cape Verde, Chad, Croatia, El Salvador, Finland, France, Germany, Greece, Guinea, Hungary, Iceland, Indonesia, Italy, Jordan, Korea, Laos, Luxembourg, Madeira, Monaco, Mozambique, Myanmar, Netherlands, Netherlands Antilles, Niger, Norway, Portugal, Romania, Suriname, Sweden, Turkey, Uruguay. Yugoslavia (former).