LetterCharacter represents a letter character in StringExpression.
Lighter
(Built-in Mathematica Symbol) Lighter[color] represents a lighter version of the specified color. Lighter[color, f] represents a version of the specified color lightened by a fraction f. Lighter[image, ...
LineIndentMaxFraction is an option for Cell, StyleBox, and Style that specifies the maximum fraction of the total page width to indent at the beginnings of lines.
LinkProtocol is an option to LinkLaunch, Install, and related functions that specifies the underlying data transport protocol to use for a new MathLink link.
Locked
(Built-in Mathematica Symbol) Locked is an attribute that, once assigned, prevents modification of any attributes of a symbol.
MessagePacket[symbol, string] is a MathLink packet containing a Mathematica message identifier of the form symbol::string.
Modal
(Built-in Mathematica Symbol) Modal is an option to functions such as CreateDialog that specifies whether the dialog that is created should be modal to the Mathematica front end.
NameQ
(Built-in Mathematica Symbol) NameQ["string"] yields True if there are any symbols whose names match the string pattern given, and yields False otherwise.
NullWords is an option for Read and related functions which specifies whether null words should be taken to exist between repeated word separators.
NumberString represents the characters of a number in StringExpression.