Over
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⍥

Over (⍥
) is a dyadic operator which takes two functions and produce a function (⍥
).
Explanation
When the resulting function is used monadically, it is the same as Atop.
(g ⍥ h) ⍵

g (h ⍵)

When the resulting function is used dyadically, then it forms an Over expression (which is the true purpose of this operator).
⍺ (g ⍥ h) ⍵

(h ⍺) g (h ⍵)

Examples
x←1 2 3
y←4 5 6
x +⍥(⌈/) y ⍝ add the max of x and max of y
9
⍝ same as
(⌈/x)+⌈/y
9