×
×Y gives direction: zero, or Y÷|Y. Pervasive.
×Y
Y÷|Y
ׯ3 0 4 ⍝ ¯1 0 1 ×0j2 ⍝ 0j1
X×Y multiplies. Pervasive.
X×Y
2x×1x 2x 3x ⍝ 2x 4x 6x