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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/firstcell_select.html).*
+
+# Square Image Of (`⊏`)
+    
+## `⊏ 𝕩`: First Cell
+    
+First major cell of `𝕩`.
+    
+           ⊏ ⟨1, 2, 3⟩
+
+           a ← 3‿3 ⥊ ↕9
+
+           ⊏ a
+
+    
+    
+## `𝕨 ⊏ 𝕩`: Select
+    
+Select the major cells of `𝕨` at the indices in `𝕩`.
+    
+           2‿0 ⊏ ⟨1, 2, 3⟩
+
+           a ← 3‿3 ⥊ ↕9
+
+           2‿0 ⊏ a
+
+