Square image of (⊏) is the Unicode character at U+228F in Mathematical Operators. Official name: SQUARE IMAGE OF. It is a square-style “image of” / subset-like relation used in specialized math notation.
Remember
Character ⊏
Unicode U+228F
Named entity ⊏
Hex entity ⊏
Decimal ⊏
CSS escape \228F
Not the same ⊂ · ⊐ · ⊑
Prefer ⊏ in HTML markup (⊏ is an alias). You can also type ⊏ in UTF-8, or use numeric forms when needed. For ordinary subset, 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+228F → ⊏. Best default in markup.
2. Hex:U+228F → ⊏ in HTML. Same glyph as the named form.
3. Decimal: same code point as 8847 → ⊏. Same result as hex and named.
4. CSS: use \228F 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 ordinary subset
U+2282 (⊂, ⊂) is the common subset symbol. U+228F is the square-style image-of form.
vs ⊐
Not square original of
⊐ (U+2290, ⊐) is the dual relation. Do not swap it with ⊏.
Name
Remember ⊏
The named entity is ⊏ — not ⊂ (that is U+2282).
CSS vs HTML
Do not mix escapes
\228F belongs in CSS strings. ⊏ / ⊏ / ⊏ belong in HTML.
Semicolon
End named entities
Always finish with ; — write ⊏, not &sqsub.
A11y
Name the relation in context
Screen readers may announce the symbol unevenly. Prefer nearby words like “square image of” when the glyph carries meaning alone.
Compatibility
Browser Support
Square image of (U+228F) and its entity forms (⊏, ⊏, ⊏, CSS \\228F) are supported in all mainstream browsers. Visible glyphs depend on Mathematical Operators font coverage.
✓ Universal support
Square Image Of (⊏)
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+228F / entitiesFull support
Bottom line: Prefer ⊏ in HTML. Use ⊏ / ⊏ when numeric form is required, and \\228F only inside CSS content.
Remember
Key Takeaways
Unicode: square image of is U+228F (decimal 8847) — glyph ⊏.
HTML: prefer ⊏ — also ⊏ / ⊏ / type ⊏.
CSS: use \228F inside content for generated text.
Meaning:⊏ is square image of — not ⊂ (⊂), not ⊐.
Use ⊏ (named), ⊏ (hex), ⊏ (decimal), type ⊏ directly in UTF-8, or the CSS escape \228F in content. Prefer ⊏ in normal HTML.
U+228F (SQUARE IMAGE OF). Hex 228F, decimal 8847. It belongs to Mathematical Operators (U+2200–U+22FF).
Yes. Use ⊏ (or the alias ⊏). Numeric forms ⊏ and ⊏ also work.
No. ⊏ is U+228F (⊏). ⊂ is U+2282 (⊂). ⊐ is U+2290 (⊐, square original of).
Use it for square-image-of / square-subset-style notation in set theory and academic math — not as a substitute for ordinary subset ⊂.
HTML entities (⊏, ⊏, or ⊏) go in markup. The CSS escape \228F goes in stylesheet strings (usually content on ::before/::after).
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Did you know?
Square image of is Unicode U+228F (decimal 8847) — glyph ⊏ in Mathematical Operators (U+2200–U+22FF). HTML5 names it ⊏ (also ⊏). Official name: SQUARE IMAGE OF. Do not confuse with subset U+2282 (⊂, ⊂) or square original of U+2290 (⊐, ⊐).
