•ucs — Unicode
•ucs Y converts characters to exact integer code points, and code points to characters, keeping the shape of Y. E•ucs Y encodes characters, or decodes integer code units, where E is "UTF-8", "UTF-16" or "UTF-32". The encoding forms take vectors. An invalid code point or a malformed encoding is a DOMAIN error.
•ucs "ABC" ⍝ [65 66 67]ₓ
•ucs 65 66 67 ⍝ "ABC"
"UTF-8"•ucs 'é' ⍝ [195 169]ₓ
"UTF-8"•ucs 195 169 ⍝ "é"•ucs⁻¹ is •ucs, with the same E if there is one.