That refers to a set that has exactly one element. Also known as a "singleton".
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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.
The unit's digit of x is not 0.
Unit occupancy capacities are generally set by town statutes. Check with the local authority for more information on how rates are set.
It is the set of all points [from some fixed point] at a distance of 1 unit, where the points on the surface of the sphere are included in the set.