Square Image Of Or Equal To (⊑)

⊑ 𝕩: First

First element of 𝕩.

       ⊑ ⟨1, 2, 3⟩
1

       a ← 3‿3 ⥊ ↕9

       ⊑ a
0

𝕨 ⊑ 𝕩: Pick

Pick the element of 𝕨 at index 𝕩.

       2 ⊑ ⟨1, 2, 3⟩
3

       b ← 3‿3 ⥊ ↕9

       2‿0 ⊑ b
6