Its a plug which contains a pronged earth which is the 3rd prong, some other plugs contain only 2 prongs and a 'scratch earth' which is only slight visible, its basically the same concept only one is more visible.
A Trident!
Anaconda Plan
Grant, Sherman and Sheridan
Actually no, It is the 3 pronged antelope :)
2 prong is a hot and neutral and a 4 prong is a 3 phase with a ground wire.3 pole 4 wire meaning 3 hots could be 240 volts or 480 volts
A three-pronged spear is called a trident.2nd Answerer says:There are several types of three-pronged spears such as the trident, trishula, leister, gig and the triple-pronged fork, used for spearfishing or combat. (The actual name that is used depends on the country.)See the related Wikipedia link listed below for more information:
The voltage is 110 V and the frequency is 50 Hz. Electrical appliances use plugs that are two-pronged and flat... similar to those used in the United States and Canada.
A 3-pronged fork, similar to the fork that the Devil has in other religions.
The third prong is a ground prong. Some appliances have 3 pronged plugs is so that if there is an electrical problem, it sends the electricity to the ground so you don't get electrocuted. All appliances should have 3 prongs, but no all outlets are made for that so they don't. Plus it uses more money to make them that way.
A long, three-pronged fork or weapon, especially a three-pronged spear used for fishing.Greek & Roman Mythology. The three-pronged spear carried by Neptune or Poseidon.
A "trident" is a type of three-pronged spear and has also been registered as the brand name for a type of chewing gum.For more details please see the Related link below.
Most air conditioners use a three-pronged (grounded) plug. However, some use outdoor plugs that aren't 115 Volt.