What ⋺ means
It marks a specialized containment relation. The long stroke distinguishes it from the ordinary contains or superset sign, but the stroke alone does not tell you how a notation system uses it.
The broader containment notation is documented in the French mathematician Joseph Gergonne’s work of 1816–17. The exact character ⋺ appears in an ISO mathematical-character listing by 1999, alongside related element-of and contains variants.
Formal and highly specialized; it belongs in defined mathematical notation.
Do not read ⋺ as ordinary unless the notation says they match.
Don't confuse it with
1
Related characters
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Questions people ask
1Why 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.
More like this
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How to type or find ⋺
- Search it as
- nisd · superset symbol · contains symbol · set containment · set notation · LaTeX symbol · math relation
- Shows up in
- Anything that takes text · its shape is whatever your font draws
⋺\22FA\nisd.Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.