What does this symbol generally mean?

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I work as a tutor, and came across the symbol $\oslash$ in the context of modular arithmetic, i.e. $5\oslash 9$ in $\mathbb{Z}_{10}$, and haven't seen this before. Does anyone know of a common definition of this? I believe it to be some definition of division in $\mathbb{Z}_{n}$, but don't know the formal definition, and would like to for when it comes up again.