$Display gives a list of files and pipes to be used with the default $DisplayFunction.
$Epilog
(Built-in Mathematica Symbol) $Epilog is a symbol whose value, if any, is evaluated when a dialog or a Mathematica session is terminated.
$PathnameSeparator is a string used as a separator when full file and directory names are constructed.
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MathLM Mathematica
Mathematica's scheduled tasks provide a way to set evaluation of arbitrary expressions in the future. Tasks can be scheduled for one-time evaluation, or for repeated ...
FASTA
(Mathematica Import/Export Format) MIME type: chemical/seq-aa-fasta, chemical/seq-na-fasta FASTA molecular biology format. Standard format for storing and exchanging DNA and protein sequences. Plain text ...
Blank
(Built-in Mathematica Symbol) _or Blank[] is a pattern object that can stand for any Mathematica expression. _h or Blank[h] can stand for any expression with head h.
Center
(Built-in Mathematica Symbol) Center is a symbol that represents the center for purposes of alignment and positioning.