Circle (○)

𝔽○𝔾 𝕩: Atop

Apply 𝔾 to 𝕩, then apply 𝔽 (𝔽 𝔾 𝕩).

𝔽 and 𝔾 must be monadic.

       -○- 5
5

       - - 5
5

𝕨 𝔽○𝔾 𝕩: Over

Apply 𝔾 to 𝕨 and 𝕩, then apply 𝔽 to them ((𝔾 𝕨) 𝔽 (𝔾 𝕩)).

𝔽 must be dyadic, 𝔾 must be monadic.

       1 +○- 2
¯3

       1 + - 2
¯1

       (- 1) + (- 2)
¯3