11  Symbols

• self - the current object [within a method context]
• *obarray* - the object hash table
• *standard-input* - the standard input stream
• *standard-output* - the standard output stream
• *error-output* - the error output stream
• *trace-output* - the trace output stream
• *debug-io* - the debug i/o stream
• *breakenable* - flag controlling entering break loop on errors
• *tracelist* - list of names of functions to trace
• *tracenable* - enable trace back printout on errors
• *tracelimit* - number of levels of trace back information
• *evalhook* - user substitute for the evaluator function
• *applyhook* - [not yet implemented]
• *readtable* - the current readtable
• *unbound* - indicator for unbound symbols
• *gc-flag* - controls the printing of 'gc' messages
• *gc-hook* - function to call after garbage collection
• *integer-format* - format for printing integers [%d or %ld]
• *float-format* - format for printing floats [%g]
• *print-case* - symbol output case [:upcase or :downcase]

There are several symbols maintained by the read-eval-print loop. The symbols  + ,  ++ , and  +++  are bound to the most recent three input expressions. The symbols  * ,  **  and  ***  are bound to the most recent three results. The symbol  -  is bound to the expression currently being evaluated. It becomes the value of  +  at the end of the evaluation.

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