el.

Webster's Dictionary (GCIDE)

1.Having the general shape of the (capital) letter L; as, an L beam, or L-beam. [Webster 1913 Suppl.]

2.Elevated; -- a symbol for el. as an abbreviation of elevated in elevated road or railroad. -- n. An elevated road; as, to ride on the L. [Colloq., U. S.] [Webster 1913 Suppl.]