Notation for specifying the fractional part of a number

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Just like the title says, what is the notation for specifying the fractional part of a number?

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2 Answers

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The fractional part of a number $x$ is usually denoted by $\{x\}$ or $\operatorname{frac}(x)$ (see Wikipedia), i.e. $\{x\}=x-\lfloor x\rfloor$, where $\lfloor \cdot\rfloor$ is the floor function.

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Braces is a common notation so the fractional part of $x$ would be denoted by $\{x\}$.

That being said, I would rather not use it without explaining it.

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