Symbols
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A symbol pushes itself on the stack when executed. By convention, symbols are used as variable names (Dynamic variables).
symbol

symbol? ( object -- ? )


Defining symbols at parse time:
SYMBOL:

SYMBOLS:


Defining symbols at run time:
define-symbol ( word -- )


Symbols are just compound definitions in disguise. The following two lines are equivalent:
SYMBOL: foo : foo ( -- value ) \ foo ;