Character equality

      'abcd' ∘.= 'cabbage'
0 1 0 0 1 0 0
0 0 1 1 0 0 0
1 0 0 0 0 0 0
0 0 0 0 0 0 0

      +/ 'abcd' ∘.= 'cabbage'
2 2 1 0

The operator / performs a fold or reduction; / works along rows while ⌿ works along columns.