From language/setbagmix

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Returns True if $a is not a superset nor equal to $b, else False. More information, Wikipedia definition.

From language/operators

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multi sub infix:<⊉>($a,$b --> Bool:D)

Not a superset of nor equal to operator.

Returns True if $a is not a superset of $b. Equivalent to !(>=).

say (1,2,3) ⊉ (2,3,1); # OUTPUT: «False␤» 
say (1,2,3) ⊉ (2,3);   # OUTPUT: «False␤» 
say 4 !(>=) (1,2,3);   # OUTPUT: «True␤»