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A sideways U opening leftwards, saying one set contains another.
Also known as: Contains sign, Is a superset of
The superset sign says that everything in the set on the right is also in the set on the left. It is the mirror image of the subset sign and means the same relation read the other way round, which is why the direction of the opening is the whole of the information.
Says that the set on the left contains every element of the set on the right.
Contexts: Mathematics
Is the mirror of the subset sign: A ⊃ B and B ⊂ A state the same fact, so the opening always faces the larger set.
Contexts: Mathematics
A curve like a letter U turned on its side with the opening facing left, drawn at the height of a capital letter.
Reads the same relation from the other side.