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  1. (international standards) Indeterminately reserved ISO 3166-1 alpha-2 country code for Lebanon., abbreviation of Republic of Lebanon
    Synonym: LB (for general use)


  1. (astronomy) Lunar radius or lunar radius: a unit of measurement, equal to the radius of the Moon.
    Synonym: R

Usage notes[edit]

This is an indeterminately reserved code, included as part of ISO 3166-1 on the request of the Secretary-General of the United Nations due to its use in designating road vehicles under the 1949 Geneva Convention on Road Traffic, and is not endorsed for general use by the ISO. The general-purpose code for Lebanon is LB.



RL (countable and uncountable, plural RLs)

  1. Initialism of rugby league.
  2. (Internet slang, uncountable) Initialism of real life.
    • 1997, Steven Shaviro, Doom Patrols: A Theoretical Fiction About Postmodernism, London: Serpent's Tail, →ISBN, →LCCN, page 138:
      I may become quite intimate with someone, spend hours with em every night, and yet not have the slightest idea what eir voice sounds like, or what eir RL body looks, feels, and smells like.
  3. (plural only) Initialism of royal letters.
  4. (machine learning) Initialism of reinforcement learning.
    • 2023 June, Daniel J. Mankowitz, Andrea Michi, Anton Zhernov, Marco Gelmi, Marco Selvi, “Faster sorting algorithms discovered using deep reinforcement learning”, in Nature[1], volume 618, number 7964, →DOI, →ISSN, pages 257–263:
      This requires keeping track of many RL algorithms and architectures, which are used as part of the state space. By contrast, our approach only focuses on training a single RL architecture, taking advantage of MCTS search and powerful state representations.

See also[edit]





  1. (accounting) Initialism of risalah lelang (auction report).