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rule
Combined from primary sources listed below.

In Grammars§

See primary documentation in context for Rules

The only difference between the token and rule declarators is that the rule declarator causes :sigspace to go into effect for the Regex:

my token token-match { 'once' 'upon' 'a' 'time' }
my rule  rule-match  { 'once' 'upon' 'a' 'time' }
say so 'onceuponatime'    ~~ &token-match; # OUTPUT: «True␤» 
say so 'once upon a time' ~~ &token-match; # OUTPUT: «False␤» 
say so 'onceuponatime'    ~~ &rule-match;  # OUTPUT: «False␤» 
say so 'once upon a time' ~~ &rule-match;  # OUTPUT: «True␤»