What is the abbreviation for liter?

Answer 1

The abbreviation, as stated on UK Goods is "L"

The abbreviation for Liter is L

The abbreviation of liter is also, "l", lower case. Since this can be confused with other figures a cursive "ℓ," is often used informally.

Answer

There is no universal official abbreviation for litre, as the unit predates the SI system. Normally, an uppercase letter would not be used in SI as this practice is reserved for those units which arise from surnames, for example "J", Joule, "N" Newton. Due to problems with fonts and confusion with the numeral "1" the upper case letter is used, as is the cursive as suggested above. The word's official spelling is, however, "litre" (International Bureau of Weights and Measures) which is consistent with the word's etymology and only the US uses the illogical spelling "liter", most likely as an extension of Webster's "reforms" which changed theatre etc.