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⊄
Combined from primary sources listed below.

In Sets, bags, and mixes§

See primary documentation in context for infix ⊄.

Returns True if $a is not a strict subset of $b, else False. More information, Wikipedia definition.

In Operators§

See primary documentation in context for infix ⊄. 

multi infix:<⊄>($a,$b --> Bool:D)

Not a subset of operator.

Returns True if $a is not a strict subset of $b. Equivalent to !(<).

say (1,2,3) ⊄ (2,3,1); # OUTPUT: «True␤»
say (2,3) ⊄ (2,3,1);   # OUTPUT: «False␤»
say 4 !(<) (1,2,3);    # OUTPUT: «True␤»