L has 11 different meanings across 5 categories:
a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints)
litre, liter
The statistic for the number of losses by a team or player limited by some criteria (e.g. this season, at home, on turf).
The twelfth letter of the English alphabet, called el and written in the Latin script.
The ordinal number twelfth, derived from this letter of the English alphabet, called el and written in the Latin script.
Clipping of lol.