SameQ
(Built-in Mathematica Symbol) lhs === rhs yields True if the expression lhs is identical to rhs, and yields False otherwise.
SmithWatermanSimilarity[u, v] gives a number representing the Smith\[Dash]Waterman similarity between strings or vectors u and v.
Splice
(Built-in Mathematica Symbol) Splice["file"] splices Mathematica output into an external file. It takes text enclosed between < * and * > in the file, evaluates the text as Mathematica input, and replaces ...
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.
Update
(Built-in Mathematica Symbol) Update[symbol] tells Mathematica that hidden changes have been made which could affect values associated with a symbol. Update[] specifies that the value of any symbol could ...
$BaseDirectory gives the base directory in which systemwide files to be loaded by Mathematica are conventionally placed.
$ImportFormats gives a list of import formats currently supported in your Mathematica system.
$LibraryPath gives the default list of directories to search in attempting to find a library.
CUDACCompilers[] gives a list of C compilers detected on system and supported by NVCCCompiler.