1. As a numeral, L stands for fifty in the English, as in the Latin language.


  1. An extension at right angles to the length of a main building, giving to the ground plan a form resembling the letter L; sometimes less properly applied to a narrower, or lower, extension in the direction of the length of the main building; a wing.
  2. A short right-angled pipe fitting, used in connecting two pipes at right angles.