| — Magnitude / Residue|Y gives magnitude. Pervasive.
|¯3 ⍝ 3
|3j4 ⍝ 5
X|Y gives residue modulo X. Real residue has the modulus’s sign or is zero. Pervasive.
3|¯1 0 1 4 ⍝ 2 0 1 1
0|7 ⍝ 7
Complex residue uses complex floor.