L6 may refer to: L6, a variety of low-alloy special purpose steel Mauritania Airlines International (IATA code: L6, ICAO code: MAI) Straight-6 engine L6, Bell Telephone Laboratories' Low-Level Linked List Language L6, instance of mathematical Lp space L 6 (keelboat), class of sailboat ISO/IEC 8859-10 (Latin-6), an 8-bit character encoding Lower sixth (grade 12) in British secondary education Products by model number Gibson L6-S guitar Motorola SLVR L6 phone PRR L6 locomotives L6 Wombat firearm Aircraft: Daimler D.I fighter Interstate Cadet L-6A light passenger plane Lucas L6, French light aircraft See also 6L (disambiguation)