Y may be any array. R is a scalar array whose item is the array Y. If Y is a simple scalar, R is the simple scalar unchanged. Otherwise, R has a depth whose magnitude is one greater than the magnitude of the depth of Y.
⊂1 1 ⊂'A' A ⊂1 2 3 1 2 3 ⊂1,⊂'CAT' 1 CAT ⊂2 4⍴⍳8 1 2 3 4 5 6 7 8 ⊂⍳0 ⊂⊂⍳0 ⊂⊂10 10
See also: Enclose with Axes.