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The mset template wraps its argument or arguments in curly brackets. If two arguments are supplied, a pipe mark is placed between them. These are used to delimit a set.
The template is designed for use inside the {{math}} template. It clarifies the template's output and avoids a need to use the magic word {{!}} or the character-substituting templates {{(}} and {{)}}.
Such notation is not only used with sets, but also Schläfli symbols and perhaps others.