1º_ Letter of the Latin alphabet . In Roman numerals, L is 50. 3º_ 'L' is symbol for "liter", "angular momentum", "Avogadro's constant", "electromagnetic self-induction". 4º_ 'L . ' is the abbreviation in botanical taxonomy for Carl Linnaeus. 5º_ 'L/' is the abbreviation for "bill of exchange". 6th_ 'l' is the preferred symbol for 'litre'. 7º_ 'l . ' is an abbreviation for "latitude, line, book, list".