Schuko

Double Schuko socket with one plug inserted. The dot in the middle of the socket is a screw head, not a third hole.
Illustration of the originally two Schuko plug and socket designs from the patent specification of patent DE567906 granted on 22 December 1932. The right-hand column shows the design that prevailed and is in use today.

Schuko (/ˈʃuːkoʊ/), also designated as plug Type F, is a connector (plug/socket) system used in much (but not all) of Europe. It is a registered trademark referring to a system of AC power plugs and sockets that is defined as "CEE 7/3" (sockets) and "CEE 7/4" (plugs) as part of the CEE 7 standards. As with most types of European sockets, Schuko sockets can accept "Type C" Europlugs.

Schuko is a syllabic abbreviation of the German term Schutzkontakt (literally: protective contact), which indicates that plug and socket are equipped with protective-earth contacts (in the form of clips rather than pins). Schuko connectors are normally used on circuits with 230 V, 50 Hz, for currents up to 16 A, although e.g. South Korea uses them at 60 Hz for historical reasons.

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