Type A   NEMA 1–15 (North American 15 /125 ungrounded)    It is used in most of North America and the east coast of South American on devices not requiring a ground connection. It has been adopted by 38 countries out of North America, including China.

Type B  NEMA 5–15 (North American 15 A/125 V grounded)   The 5–15 socket is standard in all of North America (Canada, the United States and Mexico). It is also used in Central America, the Caribbean, northern South America (Colombia, Ecuador, Venezuela and part of Brazil), Japan, Taiwan and .            

The type B plug has two flat parallel blades like type A, but has a round or U-shaped grounding prong (American standard NEMA 5-15/ 22.2, No.42). It is rated for 15 amperes at 125 volts. The ground pin is longer than the live and neutral blades, so the device is grounded before the power is connected. Nearly always both current blades on type B plugs are narrow since the ground pin enforces polarity.

Type C   CEE 7/16 (Europlug 2.5 A/250 V ungrounded)  The Europlug (plug only, not socket from the picture) is used in Class II applications throughout continental Europe (Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Czech Republic, Croatia, Denmark, Estonia, Finland, France, Germany, Greece, Greenland, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, Macedonia, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and Ukraine). It is also used in the Middle East, most African nations, South America (Brazil, Chile, Uruguay, Peru and Bolivia), Asia (Bangladesh, Indonesia and Pakistan) as well as Russia and the former Soviet republics, such as Armenia, Georgia, and many developing nations

Type D  BS 546 (United Kingdom, 5 A/250 V grounded), equivalent to IA6A3 (India), rated at 6A / 250V

Type E   French type E   , , , , , Denmark and some other countries have standardized on a socket which is not compatible with the socket () standard in and other continental European countries. The type has been authorised in since 1 July 2008, but sockets of this kind are not yet common.

Type F   CEE 7/4 (German "Schuko" 16 A/250 V grounded) . The type F plug, defined in CEE 7/4 and commonly called a " plug", is like type E except that it has two grounding clips on the sides of the plug instead of a female ground contact. "Schuko" is an abbreviation for the word Schutzkontakt, which means "Protective (that is, grounded) contact".It is used in , , , , , , , , , , , , , , , , , , , , and .

Type E/F Hybrid  CEE 7/7 (French/German 16 A/250 V grounded)   In order to bridge the differences between sockets E and F, the CEE 7/7 plug was developed.

Type G  BS 1363 (British 13 A/230-240 V 50 Hz grounded and fused), equivalent to IS 401 & 411 (Ireland), MS 589 (Malaysia) and SS 145 (Singapore), SASO 2203 (Saudi Arabia) .  The 1363 plug. This design is used not only in the , but also in , , , , , , , , , , , , , , , , , , , , , , , , , , , and . BS 1363 is also standard in several of the former British Caribbean colonies such as , , , and . It is also used in in 230 V installations although 110 V installations using the are more common.

Type H and Thai 3-pin plug   SI 32 (Israeli 16 A/250 V grounded)  Sockets made since 1989 accept both flat and round pins for compatibility with both old and new plugs.  This plug, defined in (), is unique to and is incompatible with all other sockets. This plug is also used in the areas controlled by the in the and all of the .        Thai 3 pin plug TIS166-2549 (2006) Thai multi-standard 3-pin sockets (like that shown below) safely accept unpolarised type A, B and C plugs, and also a 3 round-pin plug similar to the Israeli plug: Type H.    

Type I     AS/NZS 3112 (Australasian 10 A/240 V)     This plug, used in , , , and , has a grounding pin, and two flat current-carrying pins forming an upside down V-shape.  In China, the sockets are installed upside-down relative to the Australasian ones.   The plug is a three-wire earthed plug rated at 10 A, 250 V defined by and used in Class 1 applications in Argentina and .This plug is similar in appearance to the Australasian and Chinese plugs. The pin length is same as the Chinese version. The most important difference from the Australasian plug is that the Argentinian plug is wired with the live and neutral contacts reversed.

Type J    SEV 1011 (Swiss 10 A/250 V) has its own standard which is described in SEV 1011.

Type K    Section 107-2-D1 (Danish 13 A/250 V earthed)   This standard plug is described in the Danish Plug Equipment Section 107-2-D1 Standard sheet (SRAF1962/DB 16/87 DN10A-R). The plug is similar to the French type E except that it has an earthing pin instead of an earthing hole (and vice versa on the socket).

Type L      CEI 23-16/VII (Italian 10 A/250 V and 16 A/250 V) The earthed plug/socket standard, CEI 23-16/VII, includes two models rated at 10 A and 16 A that differ in contact diameter and spacing (see below for details). Both are symmetrical, allowing the live and neutral contacts to be inserted in either direction.

Type M    BS 546 (South African 15 A/250 V)  Type M is sometimes used to describe the 15 A version of the old British , used in and elsewhere.

全世界总共有13种插头类型，其中B, C, G 被广泛使用。 中国常用A（两脚扁平）和I（三脚扁平）。

关于插头的常用术语：

插头 plug

插孔 socket

接地  earth contact

地线 earthing pin/earth prong

火线  live pin

零线 neutral pin

长方形支脚 rectangular prong 

Reference: