2RL
2RL is an acronym that appears in several disciplines, and there is no single universally accepted meaning. In the context of transportation, electrical engineering, and rail technology, 2RL is sometimes used to denote a two-rail line or two-rail system, referring to configurations that rely on two parallel rails for guidance or power distribution, as opposed to alternative systems such as catenary or three-rail arrangements. In machine learning and artificial intelligence literature, 2RL has been used as shorthand for two-agent reinforcement learning, in which two agents interact and learn within a shared environment, though this usage is not standardized and other terms (such as MARL) are also common. In software, product catalogs, or standards documents, 2RL can function as an internal code or model designation, the meaning of which is defined by the issuing organization rather than by a universal standard.
Because 2RL is not tied to a single field, the precise meaning must be inferred from context,