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⋓

double union

Double Union

⋓ is the double union, also called the double cup, operator; its precise operation depends on the author defining it. One mathematical treatment uses it for a custom operation on sets of sets, so check the local definition before using it. As of 2026, Microsoft Word's equation editor lists <code>\Cup</code> as the command for ⋓.

Text symbol

Search it as: double cup · cup operator · double union meaning · sets of sets operation · \Cup Word
Shows up in: Anything that takes text · its shape is whatever your font draws

What ⋓ means

⋓ is the double union. Unicode classifies it as a mathematical symbol and files it in the Mathematical Operators block; this site shelves it under Maths.

Its appearance depends on the font and text styling.

How it is encoded

⋓ is a single code point, U+22D3. In HTML that is ⋓, and in CSS \22D3.

Don't confuse it with

Double Vertical Bar Double Right Turnstile

shares “double”

Questions people ask

Why does ⋓ show as a box on some devices?

Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.

How to type ⋓

Windows (Word)

Alt+XType 22D3, then Alt+X to get ⋓.

Windows

Win+Rrun charmap for the full table, or use the emoji picker's Ω symbols tab (Win + .).

macOS

Control+Command+SpaceOpen the character viewer and search “double union”.

Linux

Ctrl+Shift+UType 22d3, then Enter or Space.

HTML

⋓

CSS

\22D3

Codes and encoding1 code points

HTML decimal

⋓

HTML hex

⋓

CSS content

content: "\22D3";

Each escape is closed by the next backslash; a trailing space is needed before a literal hex digit.

URL encoded

%E2%8B%93

On screen

Code points

JS .length

UTF-8 bytes

A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.

Families this belongs to

Maths & numbers1,835 symbols

1️⃣📏📐✖️➕➖➗🟰♾️#️⃣*️⃣0️⃣