LinearSolveFunction[dimensions, data] represents a function for providing solutions to a matrix equation.
LinkInterrupt[link] sends an interrupt to the program at the other end of the specified MathLink connection.
LogLogisticDistribution[\[Gamma], \[Sigma]] represents a log-logistic distribution with shape parameter \[Gamma] and scale parameter \[Sigma].
LongestCommonSequence[s_1, s_2] finds the longest sequence of contiguous or disjoint elements common to the strings or lists s_1 and s_2.
Masking
(Built-in Mathematica Symbol) Masking is an option for various image analysis and processing functions that specifies on which regions they should operate.
MathieuGroupM24[] represents the sporadic simple Mathieu group M_24.
MaxMixtureKernels is an option for SmoothKernelDistribution and related functions that specifies the maximum number and location of kernel functions to use in the estimation.
MaxwellDistribution[\[Sigma]] represents a Maxwell distribution with scale parameter \[Sigma].
MessageList[n] is a global object assigned to be a list of the names of messages generated during the processing of the n\[Null]^th input line.
Mod
(Built-in Mathematica Symbol) Mod[m, n] gives the remainder on division of m by n. Mod[m, n, d] uses an offset d.