Question

What is the universal set?

Answer 1

ⓗⓔⓨⓐ

ⓗⓔⓡⓔ ⓘⓢ ⓨⓞⓤⓡ ⓐⓝⓢⓦⓔⓡ⬇️⬇️

The elements which contains all objects, including itself.

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Answer 2

In set theory, a universal set is a set which contains all objects, including itself. In set theory as usually formulated, the conception of a universal set leads to a paradox and is consequently not allowed. However, some non-standard variants of set theory include a universal set.