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Children's magic sets typically have a box to make coins disappear, scarves, a "magic hat", a "magic wand", a deck of cards which may or may not have special properties to assist in the "tricks", and cups and balls.
what symbol do you use when you automatically want to add a set of numbers together? the plus symbol + ?
There is only one null set. It is 'the' null set. It is a set which does not contain any numbers. It is represented by the symbol ∅.
In set theory, the symbol of intersection is ∩, like an upside down U.
The U symbol indicates a Union in set notation. This means that the resulting set is the combination of all unique items in the sets on either side of the symbol.