Square image of or equal to (⊑) is the Unicode character at U+2291 in Mathematical Operators. Official name: SQUARE IMAGE OF OR EQUAL TO. It is a square-style “image of or equal” / subseteq-like relation used in specialized math notation.
Remember
Character ⊑
Unicode U+2291
Named entity ⊑
Hex entity ⊑
Decimal ⊑
CSS escape \2291
Not the same ⊏ · ⊆ · ⋤
Prefer ⊑ in HTML markup (⊑ and ⊑ are aliases). You can also type ⊑ in UTF-8, or use numeric forms when needed. For plain square image of, use ⊏ (⊏) instead.
Using Named Entity: ⊑
Using Hex Code: ⊑
Using HTML Code: ⊑
Using CSS Entity: ⊑
Typed directly: ⊑
Notation: A ⊑ B
How It Works
1. Named:⊑ is the HTML5 name for U+2291 → ⊑. Best default in markup.
2. Hex:U+2291 → ⊑ in HTML. Same glyph as the named form.
3. Decimal: same code point as 8849 → ⊑. Same result as hex and named.
4. CSS: use \2291 in content (not an HTML entity). #point::after appends that ⊑ after the paragraph text.
5. Typed / notation: paste ⊑ in UTF-8, or write A ⊑ B for a short relation.
Pitfalls & Tips
Common mistakes when working with ⊑.
vs ⊏
Not plain square image of
U+228F (⊏, ⊏) is the basic relation. U+2291 adds the “or equal to” sense.
vs ⊆
Not ordinary subseteq
⊆ (U+2286, ⊆) is the common subset-or-equal symbol. U+2291 is the square-style form.
vs ⋤
Not the “not equal” form
⋤ (U+22E4) means square image of or not equal to — a different character with no named entity.
Name
Remember ⊑
The named entity is ⊑ — not ⊆ (that is U+2286) and not ⊏ (U+228F).
CSS vs HTML
Do not mix escapes
\2291 belongs in CSS strings. ⊑ / ⊑ / ⊑ belong in HTML.
Semicolon
End named entities
Always finish with ; — write ⊑, not &sqsube.
A11y
Name the relation in context
Screen readers may announce the symbol unevenly. Prefer nearby words like “square image of or equal to” when the glyph carries meaning alone.
Compatibility
Browser Support
Square image of or equal to (U+2291) and its entity forms (⊑, ⊑, ⊑, CSS \\2291) are supported in all mainstream browsers. Visible glyphs depend on Mathematical Operators font coverage.
✓ Universal support
Square Image Of Or Equal To (⊑)
Encode with named, hex, decimal, CSS escape, or type the character — same code point everywhere encoding is supported.
100%Browser coverage
Google ChromeSupported
Yes
Microsoft EdgeSupported
Yes
Mozilla FirefoxSupported
Yes
Apple SafariSupported
Yes
OperaSupported
Yes
Internet ExplorerAll versions
Yes
U+2291 / entitiesFull support
Bottom line: Prefer ⊑ in HTML. Use ⊑ / ⊑ when numeric form is required, and \\2291 only inside CSS content.
Remember
Key Takeaways
Unicode: this relation is U+2291 (decimal 8849) — glyph ⊑.
HTML: prefer ⊑ — also ⊑ / ⊑ / type ⊑.
CSS: use \2291 inside content for generated text.
Meaning:⊑ is “or equal” — not ⊏ (⊏), not ⊆ (⊆).
Use ⊑ (named), ⊑ (hex), ⊑ (decimal), type ⊑ directly in UTF-8, or the CSS escape \2291 in content. Prefer ⊑ in normal HTML.
U+2291 (SQUARE IMAGE OF OR EQUAL TO). Hex 2291, decimal 8849. It belongs to Mathematical Operators (U+2200–U+22FF).
Yes. Use ⊑ (aliases ⊑ and ⊑). Numeric forms ⊑ and ⊑ also work.
No. ⊑ is U+2291 (⊑). ⊏ is U+228F (⊏). ⊆ is U+2286 (⊆, subset of or equal to).
Use it for square-image-of-or-equal / square-subseteq-style notation in set theory and academic math — not as a substitute for ordinary ⊆.
HTML entities (⊑, ⊑, or ⊑) go in markup. The CSS escape \2291 goes in stylesheet strings (usually content on ::before/::after).
🤔
Did you know?
Square image of or equal to is Unicode U+2291 (decimal 8849) — glyph ⊑ in Mathematical Operators (U+2200–U+22FF). HTML5 names it ⊑ (also ⊑, ⊑). Official name: SQUARE IMAGE OF OR EQUAL TO. Do not confuse with square image of U+228F (⊏, ⊏) or subset of or equal to U+2286 (⊆, ⊆).
