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There are several symbols for universal set:

  • bold capital U -- U
  • italic capital U -- U
  • double-struck capital U -- "𝕌" in html
  • as above, but using capital E
  • small greek letter xi -- "ξ" in html

The last two above (E and "ξ" in html ) are not currently in common use and yet they cannot be mistaken for the "set union" operator -- "∪" in html (aka "cup"). On the other hand, perhaps the "mistaken similarity" is intentional: the universal set being the union of all other sets.

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