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⊌

multiset

Multiset

⊌ marks a multiset: a collection that tracks how many times each item occurs. In a formula, repeated items can stay distinct by count; the surrounding notation supplies the exact operation. ⊎ is the specifically named multiset-union operator.

Text symbol

Also called: bag notation
Search it as: multiset symbol · multiset notation duplicates · multiset union · ⊌ vs ⊎
Shows up in: Anything that takes text · its shape is whatever your font draws

What ⊌ means

Multiset notation keeps duplicates as counts.

For example, {a, a, b} contains two copies of a and one of b; an ordinary set treats it the same as {a, b}.

Read ⊌ according to the surrounding formula: it marks a multiset but does not by itself specify a particular operation.

The multiset idea extends set theory

A multiset is set-like, with an added count for each element. Older set notation already used ∪ and ∩ for union and intersection; Peano used those marks in 1888. That is background to set notation, not evidence that ⊌ descends from either mark.

Specialist mathematical notation; its role is clearest inside a formula.

For multiset union, ⊎ is the named operator; ⊌ alone does not specify union.

Don't confuse it with

⊎

Multiset Union

⊎ names multiset union, which combines each element’s counts; ⊌ marks a multiset more generally.

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 228C, 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 “multiset”.

Linux

Ctrl+Shift+UType 228c, then Enter or Space.

HTML

⊌

CSS

\228C

Codes and encoding1 code points

HTML decimal

⊌

HTML hex

⊌

CSS content

content: "\228C";

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

URL encoded

%E2%8A%8C

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