The unit of mass of SL physics engine. It is equivalent to 100 kg. The default 0.5×0.5×0.5 box weighs 1.25 Lindograms (125 kg) because the default density is 1000 kg/m³ (10 lindograms/m³).
Most physics functions work with a fundamental unit system in metres, lindograms and seconds as opposed to the MKS fundamental unit system which uses metres, kilograms and seconds.
For example, llGetMass and llGetObjectMass return the values in Lindograms. llApplyImpulse requires an impulse in Lindograms·m/s.
The exceptions are:
llSetPhysicsMaterial sets the density in kg/m³ rather than lindograms/m³.llGetMassMKS returns kg instead of Lindograms.