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What does "⋄" mean in an equation? Symbol in Functions

What does "⋄" mean in an equation?
example: (𝑓⋄𝑚)

Functions
Mina Mina
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If you mean $f \cdot m$ then it simply means multiplication. If both $f$ and $m$ are functions then $f o  m$ means composition of $f$ and $m$.

Daniel90 Daniel90
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