L Lambert

L Litre / Litre (volume) (1 liter = 100 centiliters = 1 cubic decimeter = 2.1 pt = 1.0567 qt = 0.26 gal)

LAT LATitude

Lb Pound / Livre (1 pound = 453.6 grams = 0.4536 kilogram = 2268 carats)

Lbf Pound force

Lbf-ft Pound force foot

Light See Speed of light

Light-year Année-lumière (1 light-year = 9461 x 10⁹ km = 5.88 x 10¹² miles = 63 240 AU)

LIPS Logical Inferences per Second (computing, processor)

lm Lumen (illumination)

LOD Limit Of Determination

LONG Longitude

LOQ Limit Of Quantification

LP Low Pressure

LPM Liters Per Minute / Litres par minute

LPTF Laboratoire Primaire du Temps et des Fréquences (FR)

LST Local Solar Time

LST Local Standard Time

LT Long Ton See t Ton and ST (1 LT = 1016 kilograms = 1.016 metric ton)

LT Low Tension

LW LongWave

LWIR Long-Wavelength Infrared

lx Lux