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(<=), infix ⊆
Combined from primary sources listed below.

In Sets, bags, and mixes§

See primary documentation in context for infix (<=), infix ⊆

Returns True if $a is a subset or is equal to $b, else False. More information, Wikipedia definition.

In Operators§

See primary documentation in context for infix (<=), infix ⊆ 

multi infix:«(<=)»($a,$b --> Bool:D)

Subset of or equal to operator.

Returns True if $a is a subset of $b, i.e., that all the elements of $a are elements of $b but $a is a smaller or equal sized set than $b.

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