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(m4.info)Indir

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Indirect call of macros
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   Any macro can be called indirectly with `indir':

     indir(NAME, ...)

which results in a call to the macro NAME, which is passed the rest of
the arguments.  This can be used to call macros with "illegal" names
(`define' allows such names to be defined):

     define(`$$internal$macro', `Internal macro (name `$0')')
     =>
     $$internal$macro
     =>$$internal$macro
     indir(`$$internal$macro')
     =>Internal macro (name $$internal$macro)

   The point is, here, that larger macro packages can have private
macros defined, that will not be called by accident.  They can _only_ be
called through the builtin `indir'.