Nash Equilibrium is a term used in game theory to describe an equilibrium where each player's strategy is optimal given the strategies of all other players.
Retaining rings are circular fasteners that fit over shafts or inside cylindrical products such as pipe. There are two main types: internal and external. Internal retaining rings have a diameter specified for the bore and groove sizes they will fit into. External retaining rings, also known as retaining rings for shafts, have a diameter specified for the shaft and groove sizes it fits around. Both industrial retaining ring types, also known as a retaining clip, have a thickness dimension. Measurements will be expressed in inch or millimeters. Retaining ring material varies based on application. Stainless steel retaining rings are made from one of the most common ring materials.
The most common types of rubber o-rings include viton o-rings, teflon o-rings, neoprene o-rings, silicone o-rings and nitrile o-rings. Some of these plastic materials create clear o-rings, particularly the silicone base. The food and medical fields use the clear o-rings often. Metal o-rings are also widely available. Nitrile O-rings are by far the most popular type of seal material used in the world. 2  Nitrile o-rings are carbon triple-bonded to nitrogen, which provides good resistance to oils and fuels. 3  O-ring kits are sets of o-rings that are designed to replace faulty o-rings.