SyntaxForm is an option for InterpretationBox and TagBox objects that specifies the precedence level to use when the InterpretationBox or TagBox is considered as an operator.
SystemInformation[] gives detailed information about the Mathematica system being run. SystemInformation["comp"] gives a list of rules with information about the component " ...
TableDepth is an option for TableForm and MatrixForm which specifies the maximum number of levels to be printed in tabular or matrix format.
TimesBy
(Built-in Mathematica Symbol) x *= c multiplies x by c and returns the new value of x.
TraceOff is an option for Trace and related functions which specifies forms inside which tracing should be switched off.
TracePrint[expr] prints all expressions used in the evaluation of expr. TracePrint[expr, form] includes only those expressions which match form. TracePrint[expr, s] includes ...
TransformationFunctions is an option for Simplify and FullSimplify which gives the list of functions to apply to try to transform parts of an expression.
TransformationMatrix[tfun] gives the homogeneous matrix associated with a TransformationFunction object.
UnderoverscriptBox[x, y, z] is the low-level box representation for x_y^z in notebook expressions.
UnderscriptBox[x, y] is the low-level box representation for UnderscriptBox[x, y] in notebook expressions.