Jot ∘
Jot is a Dyadic operator
Operator Jot means
Beside or Bind
Beside (function composition)
⌽∘⍳¨ 3 4 5
┌─────┬───────┬─────────┐
│3 2 1│4 3 2 1│5 4 3 2 1│
└─────┴───────┴─────────┘
¯1 ⌽∘⍳¨ 3 4 5
┌─────┬───────┬─────────┐
│3 1 2│4 1 2 3│5 1 2 3 4│
└─────┴───────┴─────────┘
+∘÷/ 40⍴1 ⍝ continued fraction
1.61803
Bind (left and right argument currying)
next ← 1∘+
next 23
24
prev ← -∘1
prev 23
22
N.B. Jot is also used in conjunction with Dot to mean Outer Product.