It is a pair of curly brackets enclosing a single element. For example {apple}.
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It is Z, except that the font used is not one of the standard ones.
The unit set of x is the set whose sole member is x. The unit set is to be distinguished from its member: for example, the unit set of the set of days of the week has one member, but that member is itself a set that has seven members.
Not sure about maening, but a unit set is a set containing only one element.
what symbol do you use when you automatically want to add a set of numbers together? the plus symbol + ?
The symbol "Ø" (the letter O with a vertical line through it) typically represents the concept of "empty set" in mathematics, indicating a set that contains no elements. It can also denote "diameter" in technical contexts or be used in engineering to represent the diameter of a circle. Additionally, in certain Scandinavian languages, it represents a vowel sound.