⊖ — Reverse first / Rotate first

Function. Keys: Alt-o Minus. Ranks: ∞ monadic, ∞ ∞ dyadic

First-axis forms of ⌽. ⊖⍠K overrides the axis.

⊖2 3⍴⍳6            ⍝ [3 4 5⋄0 1 2]
1⊖3 2⍴⍳6           ⍝ [2 3⋄4 5⋄0 1]

Inverse

⊖⁻¹Y is ⊖Y. X⊖⁻¹Y rotates Y back by X.

1⊖⁻¹[3 4⋄1 2]   ⍝ [1 2⋄3 4]