LeviCivitaTensor[d] gives the d-dimensional Levi-Civita totally antisymmetric tensor.
LevyDistribution[\[Mu], \[Sigma]] represents a Lévy distribution with location parameter \[Mu] and dispersion parameter \[Sigma].
LibraryFunctionError[name, code] represents an error returned from a LibraryFunction.
LibraryFunctionInformation[fun] returns information about a LibraryFunction.
LibraryFunctionLoad[lib, fun, argtype, rettype] loads Wolfram Library lib and makes the library function fun available in Mathematica.
LibraryFunction[args] represents a function that has been loaded from a Wolfram Library.
LibraryFunctionUnload[fun] unloads a LibraryFunction so that it cannot be used.
LibraryLoad[lib] loads the dynamic library lib into the Mathematica runtime.
LibraryUnload[lib] unloads all functions that have been loaded from a Wolfram Library, then it unloads the library.
LiftingFilterData[...] represents lifting-filter data used to compute forward and inverse lifting wavelet transforms.